High School DxD is a Japanese light novel series written by Ichiei Ishibumi and illustrated by Miyama-Zero. It is a "school love comedy battle fantasy" series revolving around themes of mythology, angels, devils, and dragons.
The main series concluded with 25 volumes in March 2018, followed by a direct sequel, Shin High School DxD, which began in July 2018. A short story collection series, High School DxD DX, has also been published since March 2015.
The Red Dragon Emperor's Awakening (Volumes 1–2)
The story follows Issei Hyoudou, a lecherous high school student at Kuoh Academy who is killed on his first date by a fallen angel named Raynare. He is reincarnated as a devil by Rias Gremory, a beautiful high-class devil, and becomes her lowly "Pawn" servant. Issei later discovers he possesses the Boosted Gear, a powerful Sacred Gear containing the soul of the Red Dragon Emperor, Ddraig. After rescuing a kind-hearted nun, Asia Argento, from Raynare, Rias reincarnates Asia as her "Bishop." Rias's arranged marriage to the Phoenix clan heir, Riser Phenex, leads to a Rating Game, where Issei's newfound power helps Rias win her freedom.
Birth of the Breast Dragon Emperor (Volumes 3–6)
The peace among the Three Factions—Angels, Fallen Angels, and Devils—is threatened by rogue Fallen Angel Kokabiel. At a peace conference, the terrorist organization Chaos Brigade attacks, and Vali Lucifer, the White Dragon Emperor, reveals his allegiance to the group. Issei achieves his Balance Breaker, the Boosted Gear Scale Mail, and later, in a desperate moment, unleashes the Juggernaut Drive to save Asia from the Chaos Brigade's Old Satan Faction, sacrificing part of his lifespan.
The Legend of the Oppai Dragon and His Lively Companions (Volumes 13–22)
A new threat emerges when Rizevim Livan Lucifer, the son of the original Lucifer, leads the Chaos Brigade's Qlippoth faction. They seek to revive the apocalyptic beast 666 (Trihexa) and invade other worlds. A joint anti-terrorism team, D×D, is formed to stop them. Issei achieves a new form, Diabolos Dragon God (D×D G), by combining his power with the dragon god Ophis. In the climactic "Evil Dragon War," the Two Heavenly Dragons defeat the strongest Evil Dragons, and Issei proposes to Rias.
The Final Chapter: Red Dragon Emperor of the Blazing Truth × White Dragon Emperor of the Morning Star (Volume 22–25, Shin Volume 1–)
After the war, an international Rating Game tournament, the Azazel Cup, begins. Issei forms his own team, the Sekiryuutei of the Blazing Truth Team, and aims for victory against powerful teams from various mythologies, including Vali's team and the team of the champion Diehauser Belial. A new conflict, the "Hell Infiltration," sees Hades and his alliance of underworld gods wage war against D×D, but they are ultimately defeated.
Issei Hyoudou
The protagonist and a second-year at Kuoh Academy. A pervert infamous for his open love of oppai (breasts), he is reincarnated as a devil and becomes the Red Dragon Emperor, wielding the Longinus Boosted Gear.
Rias Gremory
The main heroine and president of the Occult Research Club. She is a high-class devil of the Gremory clan, known for her crimson hair and kind, deeply affectionate nature towards her servants.
Asia Argento
A former nun with a pure heart who possesses the healing Sacred Gear Twilight Healing. She is reincarnated as Rias's "Bishop" and later becomes one of Issei's devoted companions.
Akeno Himejima
The vice-president of the Occult Research Club and Rias's "Queen." She is a half-fallen angel who wields powerful lightning magic and delights in teasing Issei.
Yuuto Kiba
A handsome swordsman and Rias's "Knight." He possesses the Sacred Gear Sword Birth, which allows him to create demonic swords, and seeks revenge against the church for their role in his past.
Koneko Toujou
A petite, silver-haired first-year and Rias's "Rook." She is a Nekomata (cat youkai) with immense physical strength and a deadpan wit.
The Three Factions
The three main factions of the biblical mythos: Angels from Heaven, Devils from the Underworld, and Fallen Angels from the Grigori. They were locked in a great war that resulted in the deaths of both the Biblical God and the original Four Great Satans, leading to a fragile peace in modern times.
Sacred Gears
Powerful artifacts created by the Biblical God, embedded into human souls. They grant their users unique supernatural abilities. The most powerful, capable of killing gods, are known as Longinus.
Boosted Gear
One of the 13 Longinus, housing the soul of the Red Dragon Emperor, Ddraig. Its power is to "Boost" the wielder's power every 10 seconds and "Transfer" the accumulated energy. Its Balance Breaker is the Boosted Gear Scale Mail.
Divine Dividing
A Longinus housing the soul of the White Dragon Emperor, Albion. Its power is to "Divide" an opponent's power in half every 10 seconds and "Absorb" it for the wielder's use. Its Balance Breaker is the Divine Dividing Scale Mail.
Evil Pieces
A system created by the Devil Ajuka Beelzebub to replenish their dwindling numbers. High-class devils use chess pieces to reincarnate other beings as their servants, granting them specific abilities based on the piece: "Queen," "Rook," "Knight," "Bishop," and "Pawn."
Rating Game
A formal competition between high-class devils and their peerages, modeled after chess. These games are used for training, settling disputes, and gaining social status in the Underworld.
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