Trinity Seven: Eternal Library & Alchemic Girl

Trinity Seven: 7-Nin no Masho Tsukai (literally “Trinity Seven: Seven Magicians”) is serialized in the monthly magazine Monthly Dragon Age published by Kadokawa.

The series began in the January 2011 issue (released December 9, 2010) and is ongoing, with 33 tankobon volumes published as of September 2025 and a total series circulation surpassing 4.8 million copies.

The story mixes modern fantasy, school setting, harem romantic comedy, and “pretty girl” elements with surprisingly heavy lore about magic systems and parallel worlds.

Its fantasy style is primarily low fantasy (magic hidden under modern society), but the narrative frequently escalates to world-scale battles and metaphysical entities.

The original creator Kenji Saito is a veteran scenario writer for PC games and a light novelist, while Akinari Nao provides the distinctive, fanservice-heavy yet expressive art.

To promote the first volume, Kadokawa ran a joint campaign with Nao’s other series Count Trouble, releasing volumes on consecutive days with shared bonuses.

In 2012 a drama CD covered the beginning of the story plus an original episode.

An anime adaptation aired in 2014, followed by theatrical films in 2017 and 2019, and an original smartphone game launched in 2019.

Trinity Seven builds a dense magic cosmology combining “Seven Deadly Sins” archives, higher “Heavenly Ark” roots, demon lords, heroes, and gods.

Despite the complexity, the story presents it through character banter, battles, and a lot of innuendo rather than dry lectures.

Archives and Themes

All magic is organized around Archives, each named after a deadly sin and representing a fundamental type of “Demonic” power:

Pride (Superbia)

Envy (Invidia)

Wrath (Ira)

Sloth (Acedia)

Greed (Avaritia)

Gluttony (Gula)

Lust (Luxuria)

Two additional “lost” archives once existed: Vainglory (Iritum) and Melancholy (Cavum).

Each archive contains many Themes, which are the abstract concepts magicians research (such as Dominion, Friendship, Victory, Destruction, Life, Love, and so on).

A magician’s path starts by choosing a theme that is as far as possible from their innate “self,” then researching it through study, battle, and life choices.

Every spell is an expression of this research; battles are basically magical peer review with punches, explosions, and nakedness.

Heavenly Arks (Sacred Chests)

Above the Archives lies a higher stratum called the Heavenly Arks (Clouds), rooted not in the Deadly Sins but in eight “deadly vices” plus four “cardinal virtues”:

Same or extended labels as the Archives (Pride, Wrath, Sloth, Greed, Gluttony, Lust, Vainglory, Melancholy).

Virtues: Temperance, Prudence, Fortitude, Justice.

Connection to a Heavenly Ark grants near-divine power and is normally only possible for top-class magicians called Paladins or even higher beings known as Celestial Arbitrators.

Tampering with this layer means rewriting properties at the “concept frame” level, which can erase your existence if you make a wrong move.

Trinity and Magic King Class

A magician who acquires three Themes for a single Archive and truly masters them reaches a state called Trinity.

At this point, the magician touches “truth,” can rival magic kings, and qualifies for the setting’s ultimate class: Demon Lord (Magic King) candidate.

Demon Lord candidates carry Demon Lord Factors, crystal-like cores of destructive potential.

If the factor fully awakens and overrides their personality, they become a fully awakened Demon Lord and can literally rewrite the world.

Spellcasting Basics

Magic is implemented through:

Magic Formula (Macro) – the stored program in the grimoire.

Chant (Spell) – the physical and vocal pattern to call the macro.

If you mispronounce even slightly, the spell may misfire or go berserk.

Magicians define their own “Magus Mode” outfit, a transformation which both channels their archive and provides the series with fanservice.

More advanced casters can:

Stack and parallel-cast formulas (multi-casting).

Delay chant (post-spell, casting first then chanting later).

Enter Sorcerer Mode, turning their body closer to pure magic for short, brutal fights.

Grimoires and Legendary Grimoires

A Grimoire is a dangerous, semi-sentient magical book or artifact that houses formulas and acts as a wizard’s OS.

Ordinary humans go insane just from touching high-grade grimoires.

The series’ most crucial grimoires are the two Legendary Grimoires:

Astil Manuscript (Astil’s Copy) – master of analysis, execution, copying, and even world-building.

Ilias Fragment (Ilias Fragment) – master of deciphering and support, split into multiple “chapters” with distinct personalities.

Both carry consciousness, can move, talk, take human form, and choose their own masters.

Many high-ranking grimoires are written or compiled by legendary magicians like Master Hohenheim or the West Witch Mina Seiram.

Secret Arts and Magic King Techniques

Each Archive has a single, ultimate world-building spell called a Last Crest (Magic King Ultimate).

Only the successor to the “Magic King” of that Archive (i.e., a Trinity Seven member) is allowed to wield it.

Examples include:

Time Rift (Baal Peor) – Sloth’s ultimate technique, stopping time in a bounded region and trapping the caster in a near-static world as the price.

Infinite Barrier (Aeshma Deva) – Lust’s ultimate, overwriting reality with a new world or sending targets into the “End Library.”

Holy Demon Collapse (Al-Shaitan) – Wrath’s ultimate, collapsing existence itself.

Dream Limit (A-Maimon) – Greed’s ultimate, erasing boundaries between reality and dream.

Later, the setting reveals Heaven-Emperor Ultimates, an even higher category.

The most important is Black Emperor Flame World (Leviathan), a weapon that incinerates the World Tree system itself.

The World Tree, Demon Lords, and Heroes

All parallel worlds are branches on a gigantic metaphysical World Tree.

Every world is born, develops, and eventually dies, and Demon Lords plus their Trinity Seven act as the “end-of-life process” for each world.

Key roles:

Demon Lords – world-destroying devices embodying the disease side of the system.

Heroes – the opposite; world-saving devices that repeatedly die and resurrect to stop catastrophic threats.

Paladins – high-tier magicians who have reached “truth” and edge toward the Heavenly Arks.

Celestial Arbitrators – the ultimate administrators in “Heaven,” controlling the World Tree’s overall operation.

When a Demon Lord finishes their job and destroys their world (including themselves), their factor drifts to the far end called End, where destroyed Demon Lords get a single reward: rest.

From there they can be summoned back as Demon Lord Knights, armor-clad souls and bosses for special arcs.

God-Level Entities

The series also features true gods, gigantic entities with single, pure Themes (Single Themes) such as “Evil.”

The most important is the Goddess of Deep Darkness (Arian Celestial), a god who wants to merge all worlds with herself so she can never disappear.

Fighting gods generally requires:

Full Trinity status or above.

Custom weapons or demon lord weapons meant for anti-god warfare.

Or insane world-scale hax like Seres’ loop spells and End-level sealing.

Trinity Seven’s main story follows Arata Kasuga, his path to becoming a Demon Lord, and the seven elite girls who choose to stand by him.

Along the way, the narrative wanders through weird parallel timelines, time loops, and ridiculous fights.

Basic Premise

Arata Kasuga is a 17-year-old boy living a peaceful life with his cousin Hijiri Kasuga in a small town.

One day the sun turns black, reality glitches, and Arata’s city is wiped out by a disaster called the Breakdown Phenomenon.

Arata unconsciously uses the legendary grimoire Astil Manuscript to rebuild his destroyed town as an illusion.

Hijiri breaks through his illusion, gives him the Astil Manuscript for real, and vanishes into another dimension.

A mysterious girl with a gun, Lilith Asami, arrives from a Royal Magic Academy to investigate the anomaly.

She tells Arata that his entire town has already been annihilated and offers him three choices: hand over the grimoire, die, or enroll in a magic academy.

Arata chooses the forbidden “fourth option”: become a magician, master his power, and save Hijiri.

He transfers into the Royal Biblia Academy, one of five elite magic academies in the world.

Once there, he meets seven girls who have each mastered a supreme Secret Art: the Trinity Seven.

All seven are prodigies, each embodying a Deadly Sin archive, and all are various flavors of tsundere, airhead, or pervert.

From that point, Trinity Seven becomes a mix of:

Harem romcom in a magic school.

Shonen-style power-ups and tournament arcs.

Deepening lore about Demon Lords, gods, and the World Tree.

A running gag where Arata’s “anti-magic” tends to vaporize clothes.

Arata’s Growth

Arata starts ignorant of magic but already carries a latent Demon Lord Factor linked to the archive of Pride and theme of Dominion.

His initial ability is “strip magic” – forcibly canceling other people’s magic, which unfortunately shreds their clothes in the process.

Over time he:

Learns Seven King Arts (Seventh Astral), a copy-based super-system that lets him borrow his friends’ magic styles.

Gains the Demon Lord weapon Black Emperor Sword Judeca, merges with it, and becomes a “Magic Sword Saint.”

Loses his Demon Lord Factor by using a giant spell to rescue Anastasia, then later acquires the Demon Lord Core, the crystallized essence of “Demon Lordness.”

Eventually Arata is revealed to be the “cut-away emotion” of the ultimate Demon Lord Dies Trinity, specifically the piece called Sentiment (Sensus).

Dies once killed himself to evolve from Love-as-Affection to Love-as-Pure-Concept and threw out Sensus; that thrown-out shard became Arata.

By the final major arc, Arata:

Trains in the Royal Akasha Academy and the Void Library.

Achieves “Administrator” connection to the Demon Lord Core, gaining near-omnipresent perception.

Inherits the title Black Emperor Demon Lord, while intentionally limiting his output to “just enough” in everyday life.

Arata Kasuga

Arata Kasuga is the protagonist, a cheerful, shamelessly perverted but fiercely caring boy with a Demon Lord Factor from birth.

His Archive is Pride, with Themes of Dominion, later also gaining concepts like Life, Faith, Stagnation, and Destruction.

He loves “warp” and teleportation, loves seeing people he likes smile, and absolutely refuses to tolerate anyone trampling that happiness.

He shamelessly checks girls’ chests to “judge their first impression,” but he never mocks their insecurities and genuinely respects them.

Early on he carries:

Astil Manuscript, which becomes the grimoire-girl Sora.

Ilias Fragment chapters, including Ilia.

His signature spell:

Dominion Field (Impel Magister), which forcibly cancels magic and often strips the caster.

He evolves it into selective anti-magic bullets through alchemy, and later folds other archives into it.

He is:

A born Demon Lord candidate, orphaned in a plane crash tied to magicians targeting him.

Raised with false memories that Hijiri was the orphan they took in, protecting him from early awakening.

Arata later:

Acquires Black Emperor Sword Judeca, nearly loses himself, and is saved by Lieselotte’s time-space magic.

Reaches Four Archives through intense experience, then sacrifices his factor to save Anastasia.

Journeys to the end of the World Tree to obtain the Demon Lord Core.

In the final battle he, Abyss Trinity, and Last Trinity perform a literal Trinity, confronting Dies Trinity.

Arata uses Administrator connection to seize control of the Twelve Demon Generals and channels their power plus the Trinity Seven’s to defeat Dies.

Dies grants Arata the original Black Emperor Art (Astral Ruler) in the form of the friend-focused Seven King Arts, confirming him as his successor.

Arata becomes the “second-generation Great Demon Lord” in title, but his everyday power output is deliberately throttled to “ordinary high mage unless the world is in danger.”

In the new arc, Arata:

Defeats Hijiri when she manifests as anti-Demon-Lord weapon Black Emperor Flame World (Leviathan).

Enters Leviathan’s inner world to rescue Hijiri’s remaining self, confronting the guiding “copy” of Seres and the true Goddess of Deep Darkness’ manipulation.

Astral Trinity

Astral Trinity is the independent personality of Arata’s Demon Lord Factor, born when his factor awakens.

He shares Arata’s memories but embodies pure ruthless Dominion, able to even cancel Sora’s magic.

After Arata sacrifices his factor for Anastasia, Astral should have been erased, but he survives embedded inside Anastasia.

She can summon him as a Demon Lord Knight for short bursts, with long recharge times, and he treats Arata as “the original” while openly doting on Anastasia.

“Beta-World” Arata Kasuga

In the Lieselotte Chronicle spin-off, a version of Arata from a parallel “Beta World” appears.

He has different Magus Mode aesthetics and some prior magic experience.

He ends up drained by events around Cronos Trinity, a Beta-Arata who attains Demon Lord through time magic and is ultimately erased.

When the Beta world is repaired, the causal chain that would turn that Arata into Cronos is removed.

The Trinity Seven

The Trinity Seven are seven top-tier magicians, each embodying a Secret Art for an Archive and a Theme.

They are heirs to seven Magic Kings and the “harem core” around Arata.

Lilith Asami

Lilith Asami is a 17-year-old gun mage, teacher at Biblia Academy, and one of the Trinity Seven.

Her Archive is Lust, with Themes of Life, Erasure, and Void, and she specializes in Alchemy.

She wears a beret, has crimson hair braided on one side, and is famous for her curves and striped underwear.

Her Magus Mode lets her transform her grimoire Hermes Apocrypha into more than twenty types of guns and other tools.

Personality-wise she:

Uses formal speech and tries to act strict and serious.

Completely loses composure when Arata does anything pervy, especially involving her chest or underwear.

Is deeply tsundere about her feelings for Arata, but obviously cares for him first among the girls.

She is secretly:

The daughter of Abyss Trinity (an alternate-world Demon Lord) and fallen Arbiter Arl Asasel.

Born from two beings who had conceptually transcended Lust, making her existence a key to overthrow the Deep Darkness Goddess.

In the Sky Library arc, Abyss identifies her as “my daughter Lilith = Asasel,” captures her, and forges her into the Last Key.

Arata’s Dominion frees her, and she later learns to self-activate the Lust Devil Gear Aeshma.

Over time she:

Embraces her identity as a “Demon Lord’s Daughter,” increasing her raw destructive power.

Accepts Abyss as her father and tears up over a posthumous gift from her mother: the grimoire Apocalypse of Expiation.

She is an “extraworld life form” whose growth will eventually stop, leaving her effectively immortal.

In the new arc, she pushes herself hard to prepare for the Goddess, while Abyss supports her from the sidelines and shares his past with Arl.

Arin Kannazuki

Arin Kannazuki is a 16-year-old girl who looks almost identical to Hijiri Kasuga and calls herself “the Demon Lord’s wife.”

Her Archive is Wrath, with Themes of Destruction, Creation, and Victory, and she uses Sacred Rite Arts, meaning rune magic.

Arin is calmly deadpan, socially off, and not at all shy about nudity—she can have a full bath scene with Arata and not blush.

Her catchphrase is “It’s difficult,” and she calls Arata “husband.”

She originally:

Woke up with no memories and no family, only the knowledge of being “herself.”

Was escorted to Biblia by The Headmaster while being attacked by enigmatic monsters named Outer Ones.

Arin forces Arata into an early near-Destruction by manipulating his factor during a “test,” revealing his Breakdown Phenomenon potential.

She uses her grimoire Twilight True Account (Ragna Yggdrasil) and legendary spear Gae Bolg, later unlocking its true form, Gungnir, as a War God Weapon.

Arin is in truth:

One of two reincarnation halves of Seres, the original World Tree Priestess who sealed Dies’ Demon Lord Core.

The half intended to ensure “The last key exists even if the other half is gone,” giving both her and Hijiri Trinity Seven potential and World Tree administrative rights.

In the Magic Research Grand Tournament, she acquires the true form of Gungnir and reaches full Trinity states.

In the new arc, when Hijiri becomes Leviathan’s avatar, Arin feels their link break and privately confesses loneliness to Levi and others.

She genuinely loves Arata, wants to stay with him forever, and is wholly willing to share him with the other girls, whom she frames as “household members.”

Levi Kazama

Levi Kazama is a 17-year-old ninja girl of the Envy archive, specializing in Ninja Arts (Shamanic Spell).

Her Themes are Expectation and Hope, and her fighting style is hyper-fast assassination mixed with illusions and elemental tricks.

She:

Speaks with a casual “-ssu” affect at the end of sentences.

Wears a scarf even in swimsuits and baths, and canonically does not wear underwear under her ninja outfit.

Is brutally perverted in her own way, especially toward Lilith’s chest.

Levi is famously:

One of the strongest physical fighters in the setting, “3rd or 4th strongest in the world.”

A “rare one” whose left eye, Divine Calamity Eye, can see all possible deaths and turn them into knowledge.

In the past she was the “Ma-hitotsu Princess” of Kazama Village, an avatar of a god of one eye, and was sealed until a rival clan attacked.

She wandered between villages, building up a Shadow Demon Ninja Army, only to see them slaughtered by Fruit Core Ryuuki, which seeded long-running grudges.

Her true right eye is Kishin Heaven Eye, an even more broken vision ability she hides by misleading enemies to focus on her covered left eye.

With it she:

Learns every enemy’s possible kills and counters.

Stacks “cheated” death information into her personal skill set, making her nearly impossible to kill.

In the magic tournament she intentionally holds back to avoid showing cards to Heaven, then later cooperates with Demon General Farfarear while faking struggle to trigger Dies’ exposure.

Her entire philosophy is to always assume the worst and prepare quietly while cracking jokes.

Mira Yamana

Mira Yamana is a 16-year-old small, stern girl from the Pride archive, specializing in Image Crystal Arts (Gehenna Scope).

Her Themes are Justice, Mission, and Ideal, and she is the First Chair Royal Librarian Examiner, essentially a magical auditor.

She wields a crystal grimoire Book of Mirrors, letting her analyze, absorb, and reflect magic, and once even reflected Arata’s anti-magic.

Early on she is hostile to Arata as an “unclean male,” but she slowly warms up, bakes cookies, and blushes whenever he praises her efforts.

Mira:

Works closely with her best friend Akio Fudou, often being teased for their “soft yuri” vibe.

Wears cute rabbit-pattern underwear until she starts caring about Arata’s gaze and switches to safer designs.

In the Magic Research Grand Tournament, she:

Shows terrifying potential even compared to high-level demons.

Is revealed by Abyss to carry the Hero Factor, the destined opposite to Demon Lords.

She later undergoes a brutal training under Master Akasha and Demon General Kugnazzo:

they kill her repeatedly with an eleven-sword artifact and she resurrects faster each time until she becomes nearly instant-respawn.

She then travels to Dies’ castle and kills his magic-body version almost effortlessly, proving her hero status.

In the new arc she is recruited by Heaven as a Justice Ark candidate, but told that fully becoming a Hero would strip her of her Trinity Seven status.

She is left torn between protecting the world at maximum power and staying at Arata’s side as one of his seven.

Akio Fudou

Akio Fudou is an 18-year-old tall, tomboyish fighter from the Gluttony archive, Theme Faith, and user of Mantra Enchant.

She is the Third Chair Royal Librarian Examiner and a former Shrine Maiden of Treasures connected to the Sky Library.

She wears her shirt with only three buttons fastened and a slit skirt, displaying a laid-back, big-sister energy.

Her fighting style is physical: she tattoos mantras onto her skin, buffing herself into a martial-arts monster capable of destroying walls with a kick.

Akio:

Transforms into a tiny nun-like form when low on magic, which actually increases her offense due to more concentrated mantras.

Later learns healing and more advanced techniques, and can run both body and magical projections in parallel, reaching near-Demon-Lord tech.

She and Mira are nearly inseparable; they share hair ribbons, do restaurant part-time jobs together, and trust each other’s backs in fights.

She calls Arata “dear bro,” falling for his kindness after he sympathizes with her tragic village annihilation without pity.

Over the story she:

Becomes a double-classed magic brawler.

Gains the eighth Ilias Fragment chapter, Octo, as an additional grimoire.

Is scouted by Heaven as a Gluttony Arbiter candidate and trains under Arbiter Amana, while also preparing for the Deep Darkness Goddess.

Yui Kurata

Yui Kurata is a 14-year-old genius of the Greed archive, Theme Friendship, and user of Heavy Choral Arts.

She is physically small but— in trope fashion—has very noticeable curves and an older-looking Magus Mode.

Yui:

Sleeps in a magically created Dream World to keep her insane magic pressure contained.

Sees no problem with hugging, kissing, and cuddling Arata at every opportunity, openly declaring herself his lover.

She possesses the Phantom Cross Eyes, a pair of cross-shaped irises that let her drag people into dream-realms and sculpt the world through sound.

Her grimoire Aleister’s Score amplifies her magic to nearly infinite levels within bounded spaces.

Yui once passively leaked so much magic that she would have overwritten reality with dreams if left unchecked.

After Arata’s anti-magic partially suppressed her aura, she can attend school normally, though she still casually matches Demon Generals and seals enemies in layered dreams.

In the Great Tournament and Heaven Gate incidents, she:

Demonstrates near bottomless Greed magic, killing two Demon Generals in an instant.

Uses a limited Dream Limit to trap Arbiter Albaricia in endless dreams, effectively repurposing the Demon General as her pet magic source.

Yui views the entire world as possibly her dream, with Arata as the only “real” anchor she is absolutely certain about.

This drives both her devotion and her weird calmness about extreme events.

Lieselotte Sherlock

Lieselotte Sherlock is a 17-year-old Sloth archive mage, Theme Stagnation, and user of Numerical Arts (Logos Art).

She is Selina Sherlock’s twin sister and a former Second Chair Royal Librarian Examiner who defected to the Gospel Exploration Society.

She:

Is playful, flirty, and pretends to be experienced in love while secretly having zero real experience.

Wears a very revealing Magus Mode with exposed midriff and thigh-high boots, leaning into the seductress role.

Lieselotte:

Initially appears as a villain attempting to steal everyone’s magic via a created dimension called the Eternal Library.

Traps herself in an ultra-high-speed time world as the price for using Sloth’s Magic King Ultimate, Time Rift (Baal Peor).

She later piggybacks on Selina’s body to return temporarily, then fully returns when she helps Arata stabilize Judeca.

Back in the real world she fully accepts her attraction to Arata and openly calls herself his “night-time mistress,” to Selina’s horror.

As a genius of mathematics, she was scouted by The Headmaster early and independently reached magic through trauma when her village fell.

She can interface with all alternate Lieselottes through Sloth’s time-space properties, earning the nickname Infinite Mage.

In the Great Tournament she:

Co-fights with Arata, fusing their techniques to create a joint massive spell.

Suffers from Demon Lord factor contamination and later goes into seclusion in the Eternal Library to refine herself.

In the Heaven Gate arc she emerges with the Sloth Devil Gear Belphegor, a horned Devil Gear form and fully controlled Time Rift.

Her potential is so extreme that even allies worry she might be drifting too far into pure magic.

Parallel-world versions of her appear in Lieselotte Chronicle:

some kill Selina and fuse with her, others fight Demon Lords, but in the repaired Beta world, Lieselotte saves her sister and becomes that world’s Trinity Seven Sloth.

Selina Sherlock

Selina Sherlock is Lieselotte’s twin sister, originally a grimoire camera user and mage apprentice.

She owns Alkitas’ Copy, a camera that becomes her grimoire once she awakens Sloth’s Theme Bondage.

She is:

Energetic, investigative, and loves scoops as the school newspaper reporter.

Flat-chested in contrast to Lieselotte, which Arata tactlessly calls “convenient size.”

Selina uses her camera to “stop” the superspeed world Lieselotte was trapped in, allowing Lieselotte’s consciousness to coexist in her body.

Later, to save her sister, she awakens as a full mage, obtaining Magus Mode and using her own Sloth magic.

During the Heaven Gate war she:

Is kidnapped by Demon General Million and nearly eaten.

Is rescued by Belphegor-Lieselotte, and in the final fight briefly outpaces even Lieselotte in calculations, hinting at equal potential.

Heaven later identifies Selina as the only living being with the potential to reconnect to the lost Archive Melancholy, the “missing” Eight Archive.

She is scouted as a Melancholy Arbiter candidate and moves to Heaven’s research center to figure out how to prevent world collapse and her sister’s future erasure.

Hijiri Kasuga

Hijiri Kasuga is Arata’s cousin, a Wrath archive mage with Themes Destruction, Creation, and Analysis, and user of Sacred Rite Arts.

She was originally sent by Master Liber from the Royal Liber Academy to monitor and, if necessary, kill Arata.

Publicly she is the orphan living with Arata’s family after her parents’ death.

In truth, Arata’s parents died in the accident; Hijiri is his blood-related cousin, and both of Arata’s foster parents were Liber agents implanted with false memories.

Hijiri:

Loves Arata and honestly wanted to be his bride if he had not been saddled with the Demon Lord system.

Was the original holder of Astil Manuscript and Ilias Fragment, handing them to Arata as she was pulled into another world.

She later intentionally becomes a Demon Lord-killing anti-weapon, using countless loops of death and rebirth across worlds to try to free Arata from fate.

In this state she acquires Wrath Devil Gear Seitan and Trinity-level mastery of Destruction, Creation, and Analysis.

Hijiri is also the other half of Seres’ reincarnation and, like Arin, qualifies as Trinity Seven and Final Key simultaneously.

This “two halves in one world” anomaly creates paradoxes exploited in arcs like the Nostalgia Library.

In the newest arc Hijiri:

Is sacrificed by Master Liber to become the full avatar of Black Emperor Flame World Leviathan, an anti-Demon-Lord Heaven-Emperor Ultimate.

Fights Arata blade-to-blade, loses, and is sealed as a silent sword containing her entire memory and feeling.

Arata enters Leviathan’s inner world, where he meets a Seres who is almost perfectly synchronized with Hijiri, burning eternally in black flames.

He promises to dominate and accept every single part of Hijiri, including the pain, and the two unite their wills against the Deep Darkness Goddess’ call.

Master Liber

Master Liber is a very old Paladin and Celestial Arbiter of the Gluttony Ark, title Holy (Sacer) Arbiter, who looks like a small, cranky little girl.

Her specialty is Star-Gathering Arts (Summon Astrology), which summons ancient “evil gods” as either information or weapons.

She was the head of the Royal Liber Academy and leader of the Gospel Exploration Society (Ishu Cariot), whose goal is ironic: destroy all Demon Lords and the World Tree system so worlds no longer have to end.

She is so old she remembers the Age of Great Magic War, when Dies Trinity was first sealed and Seres sacrificed herself.

Liber:

Can see across infinite loops and parallel timelines and understands almost everything that happened in side stories.

Sees herself as the one who must burn all world-ending equipment, even if it means sacrificing Hijiri, Lugh, or others she does care about.

She is also:

One of the oldest and strongest Celestial Arbitrators, titled Archbishop, effectively the chairwoman of Arbiter meetings.

Reluctantly still in office; Arbiter Amana notes she has been trying to retire.

Liber can normally only keep up with the power of Demon Lords by “renting” the power of outer gods through her pact, but she also:

Commands a legion of high-level summoned monsters.

Can change attributes at the concept-frame level when loaded into Heavenly Ark mode.

In the new arc Liber completes a long plan:

she forges Leviathan using Hijiri’s soul and nine Demon God Keys, expecting Arata’s factor to be incinerated inside it.

When Heaven tries a simpler “just kill the boy” approach and mocks Hijiri, Liber finally loses her composure, beating celestial Arbiter Faunaria into the floor with overwhelming “holy” eldritch power.

Abyss Trinity

Abyss Trinity is an alternate-world Demon Lord from the Lust archive, wielding Netherfall Arts (Abyss Fall) and the Demon Lord weapon Red Emperor Sword Kaina.

He looks almost identical to Arata, hence the nickname “Red Demon Lord,” and initially serves as the Sky Library’s last defense.

He:

Destroyed his original world “for fun” but also for research.

Lost his Demon Lord factor when Arata killed his projection, then fused with Kaina to live in Arata’s world as a “human-tier” body.

Abyss:

Is the biological father of Lilith Asami, with fallen Arbiter Arl Asasel as her mother.

Becomes a hilariously doting dad once his memories and emotions are partially influenced by Arata and Akio’s mother’s magic.

He refers to Arata as “junior” while Arata calls him “senpai.”

During Judgment Gate he fights alongside Arata and Last Trinity, forming a triple-fusion with Kaina to fight Dies’ triple-forms.

In the current arc he:

Watches over Lilith’s training and shares his and Arl’s tragic love story.

Admits his actions set many disasters in motion but chooses to help Arata and the girls anyway.

Anastasia-L

Anastasia-L is a 17-year-old Lust archive mage from the Sloth spin-off who becomes crucial in the main story.

Her Theme is the lost theme of End, and she practices Spirit Arts (Elemental Conductor), commanding planetary spirits.

She is:

The reincarnation of the Resurrection Saint, beloved by all spirits and functioning as their queen.

One of the earliest Trinity Seven in the Akasha timeline, predating Lilith’s arrival.

When Abyss sends Lilith from another world 17 years in the past, Anastasia’s existence is paradoxed.

To save the collapsing world, she uses Lust’s Infinite Barrier (Aeshma Deva) and sacrifices her existence, becoming the core of End Library, the resting place of Demon Lords.

Years later she:

Is revived partially by Master Akasha, returning to the world briefly as a fragile “spirit.”

Designs the entire Rogue Magic Tournament arc as a way to trap Arata and Trinity Seven in End so she can have them forever before she fades.

She loses that battle, and Arata pays his Demon Lord Factor to pull her fully back into reality.

As a side effect, his factor, now the Astral Trinity, becomes her Demon Lord Knight.

In the “Anastasia Gospel” spin-off, she later awakens as Silver Demon Lord Anastasis Trinity, wielding anti-Demon-Lord Weapon Antenora and the Lust Devil Gear Aeshma.

She is forced toward Demon Lordhood to keep the Demon Goddess from consuming Pandora, and her story interweaves with the main timeline’s future.

The Headmaster

The Headmaster of Royal Biblia Academy is a tall man with long silver hair and glasses, always smiling like a suspicious host.

He is a Paladin and Celestial Arbiter of the Wrath Ark, titled Ratio Arbiter, and wields Word Arts (Babel Script) and the dangerous grimoire Gate of the King.

He:

Recruits most of the Trinity Seven in their childhoods, recognizing their extreme irregularities.

Enjoys orchestrating dangerous situations to push Arata toward growth.

In Heaven, he sits at the Taurus chair and is recognized as a “black sheep” among the Arbiters.

He belongs to the faction that wants to conciliate Demon Lords rather than kill them, but his methods are twisted.

He returns to Heaven for the first time in ages with Mira, Akio, and Selina as Arbiter candidates.

His past includes lineages from the fallen Pride Arbiter Azasel and close involvement in the Great Magic War.

Sora and Ilia

Sora is the grimoire-girl form of Astil Manuscript, originally Hijiri’s.

She appears as a gothic-lolita girl with a large ribbon, speaks in a casual, cheeky tone, and calls Astil Manuscript’s original body “Mom” (Radix Astil).

Sora:

Manages Arata’s copy-magic, calculates the three-step process to copy others’ spells, and often comments on his pervy antics.

Shares core with high-tier legendary grimoire Radix Astil, who later joins Dies.

Ilia is the human form of the third chapter of Ilias Fragment, nicknamed Tres by her sisters.

She once acted as a stand-in “Hijiri” and caretaker for Arata before the Breakdown, and later appears as a manipulative, flirtatious grimoire maid.

She and the other chapter-sisters:

Serve West Witch Mina Seiram.

Are used by Demon Generals and Radix as test pieces and eventually reside with Akio and others after the Heaven Gate war.

Octo, the eighth chapter, later becomes Akio’s grimoire partner.

Radix herself descends early to “collect Sora” but ends up supporting Arata and Dies’ dynamic instead.

Royal Biblia Academy

Royal Biblia Academy is a boarding magic school built over ancient ruins, supported by various nations.

Its mission is to train magicians, solve Breakdown Phenomena, and quietly manage magical crises.

It houses:

The Royal Library Examiners, who go out to break down Breakdown cores and research magical incidents.

The Trinity Seven, who double as teachers, elite investigators, and walking disasters.

The Academy is formally one of five Royal Magic Academies: Biblia, Liber, Akasha, and two unnamed others.

Its buildings include a huge underground labyrinth, a Sky Library above, and a hot-spring facility because “healing” is important.

Royal Liber Academy

Royal Liber Academy was another top-tier school, focused on magical artifacts and devices.

It was destroyed by an arranged Breakdown used to erase it from the world.

The Liber Academy’s ex-headmistress is Master Liber, who now leads the Gospel Exploration Society (Ishu Cariot).

Her group includes Hijiri, Lugh, and other magic king-level followers who all carry Demon Lord Factors or Trinity-level modifications.

Their stated purpose: kill Demon Lords and destroy the Demon King system so worlds no longer have to die.

They use ethically dubious methods, including mass sacrifice and factor experimentation.

Royal Akasha Academy

Royal Akasha Academy is the third Royal Academy, once led by Arbiter Etheria, now by her daughter Master Akasha (Arsha).

Its research centers on weapon enchantment, magical equipment, and deep concept manipulation.

Facilities include:

The Void Library, a time-accelerated storage that allows intense training.

Treasure vaults of dangerous artifacts, including multiple God Weapons.

Arsha is a talented but emotionally blunt magic girl with many built-in talents, including heavy choral arts and weapon mastery.

She hunts for Anastasia in End, hosts the Rogue Magic Tournament, and later joins Arata’s party into Judgment Gate.

Gospel Exploration Society

The Gospel Exploration Society (Ishu Cariot) is Master Liber’s personal organization formed after Liber Academy’s erasure.

Members include Hijiri, Lugh, and others.

They:

Collect Demon God Keys and Demon Lord weapons.

Aim to break the world’s “magic king system” by killing Demon Lords and rewriting core rules.

Liber’s methods frequently clash with Biblia’s, but both groups sometimes cooperate against bigger threats like Dies or the Goddess.

Arbiter Factions in Heaven

The Celestial Arbiters are the top twelve administrators of the Heavenly Arks, each seated under a zodiac sign.

They’re split into two broad factions:

Demon Lord Extermination Faction – wants Demon Lords dead to prevent the Goddess’ revival.

Demon Lord Conciliation Faction – aims to tame Demon Lords or redirect them.

Important Arbiters:

Etheria Akasha, Decider Arbiter of Pride and current Arbiter Chair, Arsha’s mother.

Aries Cardia, Time Arbiter of Sloth and Beta-world Sloth Trinity Seven.

Faunaria Road, Light Arbiter of Temperance, arrogant and battle-focused.

Maris Stella, Beauty Arbiter of Prudence, with absolute “no magic hits me” defense.

Harukage Minamoto, Shadow Arbiter of Greed, calm and quietly scary.

Amana Murakumo, Power Arbiter of Fortitude, friendly sword freak training Akio.

The unnamed Lust Arbiter, who clones End weapon Antenora and stirs up Anastasia and Pandora.

Trinity Seven’s successes and the Demon Lord wars draw Heaven’s full attention, and new arcs revolve around these Arbiter politics.

TV Anime

A 12-episode TV anime adaptation titled Trinity Seven aired from October 8 to December 24, 2014.

It was produced by Seven Arcs Pictures and aired on TV Tokyo, TV Aichi, TV Osaka, and AT-X.

Key staff:

Director – Hiroshi Nishikiori.

Series composition – Hiroyuki Yoshino.

Character design & chief animation director – Shinpei Tomooka.

Music – TECHNOboys Pulcraft Green-Fund.

Animation studio – Seven Arcs Pictures.

Production committee – Avex Pictures, Kadokawa, TV Tokyo, AT-X, and others.

The anime covers early manga arcs: Arata’s awakening, Yui’s dream incident, Sky Library, and the Gospel Society conflict.

It emphasizes fanservice and character banter while squeezing in parts of the lore.

Music:

Opening – “Seven Doors” by ZAQ.

Multiple ending songs, each duet by two Trinity Seven members with music by TECHNOboys, including:

“BEAUTIFUL≒SENTENCE,” “SHaVaDaVa in AMAZING♪,” “ReSTART ‘THE WORLD’,” and “TRINITY×SEVENTH+HEAVEN.”

Six Blu-ray/DVD volumes were released in 2014–2015, with extras like OVAs and bonus commentary.

An OVA “Seven Deadly Sins and Seven Magicians” was bundled with manga volume 11.

Films

Two anime films continue the story with original side plots that align with the novel continuity.

First film – Trinity Seven: Eternity Library & Alchemic Girl (2017)

It introduces Last Trinity and Lilim, linking to the second light novel and Akasha Academy.

Released February 25, 2017 by Avex Pictures.

Runtime: 55 minutes.

Key staff mostly follow the TV series.

Theme song: “Last Proof” by ZAQ.

Second film – Trinity Seven: Heaven’s Library & Crimson Lord (2019)

It focuses on Demon Lord-level Arata and Judgment Gate, and carries a PG-12 rating due to heavier content.

Released March 29, 2019.

Runtime: 60 minutes.

Theme song: “Against the Abyss” by ZAQ.

Both films retain the harem comedy tone while increasing battle spectacle and cosmic stakes.

They also expand on Lilim’s role, Alchemic Girl lore, and Last Trinity’s connection to Dies.

Drama CD

A drama CD adapting the first two manga chapters plus an original episode was released on September 7, 2012 by Frontier Works.

Kenji Saito wrote the script, Akinari Nao drew the jacket illustration, and it featured a pre-anime voice cast.

Staff included director Nami Sekine, sound production Dream Force, and composer MERONEST.

The tracklist consisted of three drama episodes and a free talk segment.

Light Novels

Trinity Seven: The Novel is a light-novel side series written by Kenji Saito.

It expands on the main story with original episodes and deep background arcs.

Published under the Dragon Comics Age label, three volumes are out:

1. Night Episodes and Lost Memories – short stories and character backstories.

2. Eternity Library and Alchemic Girl – basis for the first film.

3. Holy Maiden and the Eighth Archive – introduces Seres and the Vainglory archive.

Spin-off Manga

Trinity Seven has multiple spin-off manga exploring side characters and timelines.

Trinity Seven: Levi Ninja Chronicle – focuses on Levi Kazama’s ninja past, shadow clans, and Demon General Drag-nazzo’s lineage.

Trinity Seven: Lieselotte Chronicle – follows Lieselotte through a collapsing future and her journey to Beta worlds to save Selina.

Trinity Seven-san – 4-panel gag series with exaggerated comedy versions of the cast.

Trinity Seven: Seven Days – recounts the seven days after Anastasia’s rescue.

Trinity Seven: Anastasia Gospel – chronicles Anastasia-L’s struggle with End and Pandora, and her awakening as Silver Demon Lord.

Trinity Seven: Revision – introduces new protagonist Mitsunari Miyazawa, a high school boy fused with grimoire Lydia, plus girl mage Suzuka Shinonome and a “Book Burning Squad.”

Each spin-off deepens a different part of the magic ecosystem: ninja techniques, Sloth time-space magic, End Library, Arbiter politics, and an alternate-main-character campaign.

Games and RPG

Two main smartphone projects exist.

A Mobage browser game titled simply Trinity Seven ran from December 2014 to December 2015.

Trinity Seven: Phantom Library & the Seventh Sun ran from March 22, 2019 to June 13, 2023, featuring original characters, gacha elements, and battle systems.

A tabletop RPG, Trinity Seven RPG, was released by Kadokawa in April 2019.

Designed by Kenji Saito’s Ex-writers and rules designer Takito Izumikawa, it lets players adopt Archive-Themes, Magus Modes, and reproduction of the manga’s ridiculous spell combos, with sample characters and starter scenarios.

The main manga, Trinity Seven: 7-Nin no Masho Tsukai, is released by Kadokawa under the Dragon Comics Age imprint.

Volumes 1–33 were released between July 2011 and September 2025, with regular reprints responding to anime and film boosts.

Each volume often includes:

Author and artist commentary.

Four-panel gag segments.

Occasional crossovers and promotional art from other manga artists.

There are also:

An official guidebook Wisdom Book, explaining archives, themes, and characters with bonus comics.

A comic anthology featuring short stories by various guest mangaka.