Shizuka Yoshimoto

Name: Shizuka Yoshimoto

Gender: Female

Age: 15

School: Ohana no Mitsu University Affiliated High School, Class 1-4

Year: First-year high school student

Birthday: November 1

Zodiac Sign: Scorpio

Position: Library Committee member

First appearance (manga): Volume 1, Chapter 3

First appearance (anime): Episode 3 ("Bibin!!" episode)

Rentarou Family join arc (anime): Episodes 3–5

Theme BGM: "I Would Very Much Like to Ask for Your Favor"

Image song: "Zutto, Gyutto" ("Forever, Tightly")

Voice actress (drama CD): Manaka Iwami

Voice actress (TV anime): Maria Naganawa

Entrance exam / midterm result: 44th out of 240 students

Shizuka is Rentarou Aijou’s third fated girlfriend.

She is characterized as a quiet, literary-minded girl who absolutely loves books and spends most of her time in or around the library.

She serves as a library committee member and almost always wears an armband on her left upper arm when in school uniform.

She communicates primarily through lines taken from her beloved book "Crown Love Story" and, later, through a text-to-speech app on her smartphone.

Shizuka is physically tiny, incredibly light, and repeatedly treated like a child or a small animal despite being 15.

Within the Rentarou Family harem, she occupies a mascot-like position and is known as the physically weakest member.

Shizuka is extremely petite, with a very small face and a small mouth.

Her body is childlike enough that, even though she is 15, she is often treated as a little girl in-universe.

Her height is roughly the same as that of Kusuri Yakuzen in her eight-year-old form and Chiyo Iin, firmly placing her in the "loli-sized" group.

As the story progresses and more short girlfriends join, she often appears in visual gags with them, such as all of them wearing bun hairstyles and overalls in Chapter 173.

She has long, dark blue hair (somewhere between indigo and navy) with a natural wave, and blue eyes.

Her wavy hair reacts subtly to her emotions, with strands bouncing or moving when her feelings stir.

Her school uniform is worn in a textbook-proper way, with a relatively long skirt and no flashy modifications.

She always wears her library committee armband on her left upper arm; sometimes the text on it is simplified to just "library" in-universe.

Her casual clothes tend to be modest with low exposure.

During pool episodes, she wears a standard school swimsuit rather than anything more revealing.

Shizuka is serious, studious, and polite, with a gentle and considerate personality.

She is not naturally a "boke" (goofy) type; instead, she tends to occupy the straight man (tsukkomi) role within the chaos of the Rentarou Family.

She is deeply self-conscious and has low self-esteem at the beginning of the story.

Being mocked by classmates and harshly scolded by Shizuka’s Mother for her unusual way of communicating leads her to consider herself "a weird kid" and to withdraw from others.

Despite that, she is very empathetic and sensitive to others’ feelings.

Her experience with books helps her read people’s emotions and intentions, and she often notices when someone is hurting or crossing a line.

Shizuka is shy and easily flustered, especially about romantic or sexual topics, but she does have normal teen curiosity and desire for affection.

She can be surprisingly bold with Rentarou—initiating kisses, seeking physical closeness, and, in her dreams, imagining adult-style cuddling in bed with her lover.

Her seriousness can flip into sharp, deadpan snark when she delivers a tsukkomi.

Because she speaks using lines from fiction, her comebacks are often over-dramatic, archaic, or unexpectedly harsh in wording, which makes them funnier.

Academically, Shizuka is solid and more than competent.

In the midterm exams she ranked 44th out of 240 students, placing her well above average.

Physically, however, she is extraordinarily weak, even by comedic standards.

She is described as so light that strong winds can blow her into the air, and she is frequently shown floating or nearly flying away in gusts.

In gym or sports activities, she is easily overwhelmed.

In baseball, when she tries to swing a bat, she is practically swung by the bat instead, and she loses even in arm wrestling to the notoriously weak Saki Tomogara, although it ends up being a close match that makes Saki nervous.

Her swimming ability is poor.

At a leisure pool, she relies on a swim ring; when it bursts, she gets stranded on an artificial island in the lazy river current.

At the Hanazono family’s home pool, she impulsively jumps into the water but then almost drowns and has to be rescued by Nano Eiai and Kusuri Yakuzen.

In high-flow water-based games such as an intense flowing somen competition, she is spun like a top by the current.

She also struggles with carbonated drinks and generally sticks to still juices like orange juice or apple juice.

An exception is when Meru Zetsubouda gives her an energy drink (similar to Monster); Shizuka dislikes carbonation but drinks it anyway because she cherishes Meru as a fellow creator and "battle companion" in writing.

When she becomes tipsy (or tipsy-like) from such drinks, "bad Shizuka" appears—but her "bad" behavior is extremely mild, like lying down to read books.

Refusal to Speak and Use of Books

The core of Shizuka’s characterization is her difficulty with speaking using her own voice.

From early childhood she has been unable to speak smoothly, often stuttering on the first syllable, which made her dread verbal communication.

To cope, she developed a unique communication method: she carries her beloved book "Crown Love Story" wherever she goes and uses it to "speak."

Specifically, she finds and points to a single sentence or character line in the book and has the other person read it aloud, using that quote as her response.

She has reread this book so many times that she knows its contents by heart and can instantly locate the needed phrase, making this method actually functional in conversation.

She herself describes this as a "completely natural skill" she acquired over time.

Her classmates have called this behavior "creepy," and Shizuka’s Mother has slapped her and shouted, "Why are you such a strange child?"

These experiences crush Shizuka’s confidence, making her believe that people will inevitably hate or reject her.

Rentarou’s Support and the Text-to-Speech App

Rentarou Aijou does not try to "fix" Shizuka in the conventional sense.

He openly acknowledges that telling her to "just work hard and talk normally" would be insensitive, because he cannot understand how difficult speech is for her.

Instead, he decides to help her communicate more easily in a way that does not force her beyond her limits.

He takes volume 1 of "Crown Love Story" and spends several days manually typing the entire text into a text-to-speech app on her smartphone.

With this, Shizuka can now select sentences and have the app read them out loud, allowing her to look people in the eye while "speaking."

In the anime, it is explicitly noted that there is no e-book version of the novel, emphasizing that Rentarou literally typed every word himself.

Later, Rentarou types all of volume 2 and beyond into the app in a single night.

From that point on, Shizuka mainly communicates through this text-to-speech app instead of physically pointing at the paper book.

Her text-to-speech lines are usually written in the story with brackets or similar markers to show that it is the app speaking and not her actual voice.

Interestingly, in the anime the voice produced by the app uses Shizuka’s own voice (the same voice actress), raising amusing questions about how such a voice sample could have been created given how rarely she speaks.

Style and Tone of Her "Speech"

Because her lines are mostly quotes from "Crown Love Story" and possibly other books, her speaking style is highly inconsistent.

Her speech mixes formal "I declare"–style sentences with polite "desu/masu"–equivalents, produces archaic or noble phrasing in everyday situations, and sometimes breaks into subordinate-like slang such as "for the boss, sir" or "for the gang."

She often laughs silently with her own voice by giggling softly.

However, when Rentarou tickles her or when she wants to "laugh" via the app, she often plays the stock phrase "She laughed loudly," which functions as a kind of mechanical laugh track.

When extremely emotional or in a crisis, she occasionally speaks with her real voice, though it remains halting:

When she is drifting helplessly in the lazy river and calls out faintly for Rentarou to help.

When Rentarou or Hakari Hanazono are in danger and she desperately tries to intervene.

When she is in situations where she cannot hold her phone (sports, emergencies).

Over time, particularly as the Rentarou Family grows and she feels more secure, moments of vocal speech become slightly more frequent and somewhat more fluent.

Still, her default remains the app and her beloved book quotes.

Psychological Nature of Her Speech Difficulty

Readers have speculated that Shizuka’s difficulty is similar to stuttering (disfluency), especially because she repeats initial sounds and because she can sing normally.

Real-world people with stuttering often report that singing is unaffected, which aligns with Shizuka’s behavior.

Flashbacks in Chapter 135 show that even in infancy and early childhood she could not speak smoothly.

However, several body-swapping incidents in the series shed light on her condition.

When another character’s consciousness occupies Shizuka’s body (such as Kusuri’s experimental "reborn" potions used on Nano Eiai or Kishika Torotoro), that person can speak normally using Shizuka’s body.

Conversely, when Shizuka’s consciousness is placed into another person’s body (such as Karane Inda’s), she still struggles to speak smoothly and often defaults to the app.

This strongly implies that Shizuka’s difficulty is not a physical defect of her vocal apparatus but a psychological or "soul-level" issue.

Her avoidance of voice, and reliance on the app, is so ingrained that even in sleep she taps or triggers lines from the app as sleep-talk.

In one case, the side effect of sleeping pills causes her to have a nightmare in which Rentarou dies.

Even while asleep and crying, she uses the app to play lines like "Tears just never seem to dry up, do they…," suggesting that her brain has conditioned itself to use the device as her "mouth."

When turned into a "kiss zombie" without conscious control, she still emits the word "kiss" via the app instead of using her real voice.

She even subconsciously assembles complex lines by stitching together multiple words or phrases in the app, a level of unconscious phone operation that is played both for comedy and pathos.

Notably, the narrative and characters never treat her condition itself as a joke.

Her style of speech may be used for humor, but the trauma and difficulty behind it are handled with care.

Shizuka is a hardcore bibliophile whose whole life revolves around books.

Rentarou often remarks that she smells like old volumes and the gentle scent of the library.

She spends much of her free time in the school library, both as a committee member and as a reader.

Her favorite genre leans toward fantasy and medieval "knightly romance" stories, filled with chivalry, noble ladies, and epic quests.

She remembers her favorite books almost word-for-word and can pinpoint specific lines instantly.

Her emotional relationship with reading is profound: she feels that books, especially "Crown Love Story," have saved her and given her a place to belong.

This deep love for stories later leads to her own attempt at writing, under the influence of Meru Zetsubouda.

Meru, an author of a gentle, dreamlike picture book called "Yume-chan and the House in the Sky," encourages Shizuka by asking why someone who loves books so much has never tried writing one herself.

At first Shizuka struggles and hits a major creative wall, feeling her writing is clumsy and inadequate.

After reading Meru’s heartfelt encouragement letter, she cries and pushes through, completing her own story.

Meru tells her that everyone has a story only they can create and that such works cannot be measured by comparison.

This reinforces Shizuka’s self-worth and confirms that her love of books has value beyond passive reading.

After this, Shizuka and Meru often work together in the library, writing side by side.

Editorial notes emphasize a theme: one person’s story can save another person’s story, creating a chain of healing through narrative.

The Book Itself

Shizuka’s beloved book is titled "Crown Love Story."

It is clearly patterned after the real-within-the-series novel "Secret Love School-y," written by Rikiya Nakamura, and many character names in "Crown Love Story" are parodies or references.

Examples include:

Kamakura Tomohiro → Knight Kamakur

Taharaba Io → Princess Io

Within the series, "Crown Love Story" is a medieval knightly romance where the knight Kamakur serves and protects Princess Io in a Western-style fantasy kingdom.

The genre is knightly romance, focusing on chivalry, loyalty, and love, with the knight facing formidable foes for his lady.

The author pen name is Moto Kakuyo.

Shizuka has read up to at least volume 7, and in the poet Uto Nakaji’s room, volumes 1–7 can be seen on the shelf.

Oddity of the Quotable Lines

Despite being a romantic fantasy, many of the lines Shizuka quotes are bizarre and out of place for such a genre, which is a running gag.

Some recurring quoted lines include things like:

"I myself am an additional warrior, so I have no objection."

"Ah, boss! Is this the Shangri-La of my dreams, sir?"

"Step over my corpse and move forward."

"You have to live. You have to live."

"Cease at once! Do you not care if you disappoint your master?"

"Little girl… Uncle has something nice for you, come over here…"

"That line, I can only pray it is not foreshadowing."

"Do not stand before me, you freak. Lick my shoes, you freak."

These lines, combined with her serious face, create a chaotic, meme-worthy speech pattern.

It is unclear how all of them fit into a single coherent fantasy narrative, which itself has become an in-universe joke.

It is possible that Rentarou or Shizuka have added lines from other books into the text-to-speech library.

In any case, it means that Shizuka’s "voice" is built from wildly diverse and occasionally sketchy texts.

When she reconciles with her mother, Shizuka uses lines like "I love your rolled omelets" and "Thanks to you raising me with such care" in a smoothly connected way.

Even there, however, closer reading shows that she is still stitching together multiple short phrases, confirming her reliance on textual fragments.

A spin-off novel titled "The 100 Girlfriends Who Really, Really, Really, Really, Really Love You: Side Love Story – Secret Love Story" reveals exactly which scenes some of these quotes come from in "Crown Love Story."

This meta-textual layering further cements her identity as the "girl who speaks in citations."

Meeting and the Real Author

Rentarou eventually applies repeatedly for a signing event with Moto Kakuyo by sending an absurd number of postcards.

He finally wins, hoping to give Shizuka a chance to meet the person whose work saved her.

When they arrive, however, they find a chain-smoking drunk pretending to be Moto Kakuyo, orchestrated by a jealous author nicknamed "the drunk," who envies Kakuyo’s sales.

The impostor wants to ruin Kakuyo’s image.

Rentarou discovers the truth and begs the impostor to cooperate, saying that the real author’s behavior would be "too shocking" for Shizuka.

The impostor ultimately reforms, and the real Moto Kakuyo, who had been lured away to a "most sleepy sunny seat" and knocked out, awakens.

Shizuka meets the genuine Moto Kakuyo, thanks her for writing books that saved her life, and receives a signed copy of "Crown Love Story."

She is so happy that she literally floats with joy.

Moto Kakuyo, moved by her words, vows to never again lose her way and continues writing for readers like Shizuka.

This scene echoes Shizuka’s own journey with writing under Meru’s guidance, reinforcing the idea of stories saving both readers and authors.

Shizuka is comically, almost supernaturally, weak and fragile.

She is so light that a strong wind plus a towel used like a parachute can make her glide through the air.

As the series goes on, even simple gusts threaten to lift her off the ground.

At one point she is described as a "summer fairy of Sukusugi Town," floating in the breeze like fluff.

Her body is depicted as extremely light and weak to the point that even a territorial guard dog instinctively decides to protect her instead of attack.

This leads to one of her running nicknames: "Mijinko Rabbit," essentially "the weakest creature in nature," on par with microscopic plankton and a helpless bunny.

Other characters comment:

Nano Eiai: "Her weakness is extraordinary."

Rentarou Aijou: "She is the ultimate frailty that overturns the laws of nature."

Karane Inda: "This is how prey fights back."

Kusuri Yakuzen: "She is the weakest creature in nature: Mijinko Rabbit."

In Chapter 178, the narrator himself calls her "Mijinko Rabbit."

In Chapter 211, the subtitle explicitly labels her as "The Weakest in Nature (Mijinko Rabbit)."

Her weakness often turns her into a target for enemies in games or competitions.

In a baseball game story arc, the opposing catcher uses psychological attacks to make her cry, infuriating the entire Rentarou Family.

Seeing Shizuka genuinely hurt, the family collectively awakens into "Super Iya-jin," a parody of Super Saiyan, powered by love and anger.

Rentarou even tells the villain, "You kicked the forbidden Pandora’s box," implying that harming Shizuka is the one unforgivable line.

Shizuka is Rentarou Aijou’s third fated soulmate.

Their relationship is central both to her character development and to the overall tone of the series.

How They Met

They first properly "connect" in the school library.

Rentarou is trying to reach a book, their eyes meet, and Shizuka experiences the series’ trademark "bibin" shock of fate.

As a library committee member, she recommends a huge stack of books to him.

However, Rentarou doesn’t have a library card yet and can’t check them out.

Instead, she lends him her most precious possession: volume 1 of "Crown Love Story."

Rentarou reads it, genuinely loves it, and returns it with heartfelt praise, causing Shizuka’s feelings for him to deepen.

She then sees Rentarou in an affectionate moment with another girlfriend and is crushed, believing that her love is hopeless.

Despite that, Rentarou calls her out later and presents her with the text-to-speech app he created from "Crown Love Story."

Realizing how much effort he invested purely to make her life easier, Shizuka is overwhelmed.

Unable to stop herself, she confesses to him, fully expecting to be rejected since he already has girlfriends.

Rentarou accepts her confession without hesitation and asks her to be his girlfriend as well.

This moment is considered one of the early emotional peaks of the series and is a turning point for both characters.

Their Ongoing Relationship

After they start dating, Shizuka becomes more proactive and open with Rentarou.

She allows herself to be more cheerful and active, emboldened by his unwavering acceptance and the presence of the other girlfriends.

She calls him "Rentarou-kun," using a polite but affectionate suffix.

Physically, she often rides on his shoulder due to her small size, and he holds her carefully in strong winds or crowded places.

After their first kiss, she becomes notably more assertive in initiating kisses.

She repeatedly chooses to kiss him of her own volition, showing that her shyness does not prevent her from expressing desire when she feels safe.

Rentarou’s support of Shizuka—especially in Chapter 3—also serves a meta-narrative purpose.

Many readers cite this chapter as the moment they realized Rentarou is not a generic harem protagonist but a genuinely kind and thoughtful partner, capable of supporting 100 girlfriends in a believable way.

The series repeatedly uses Shizuka’s vulnerability as a test of Rentarou’s empathy and the family’s solidarity.

Whenever someone hurts her, the Rentarou Family unites fiercely in her defense, underlining how beloved she is.

Nano Eiai

Nano Eiai is Shizuka’s classmate and frequent partner in scenes.

They appear together so often that fans consider them a duo.

Shizuka adores fantasy aesthetics.

When Nano dresses in a princely male outfit, Shizuka quietly refers to her as "my knight" and takes pictures, clearly smitten with the chivalrous appearance.

Nano is extremely protective of Shizuka.

During a beauty contest-style game with Mimimi Utsukushisugi, Nano is supposed to talk about Shizuka’s "beauty," but she instead blurts out how "cute" Shizuka is, revealing her bias.

Shizuka, in turn, frequently and unconsciously sabotages Nano in games by acting unpredictably or simply being too cute and harmless.

This has led to her being nicknamed a "Nano Killer" during competitions.

Nano and Shizuka are shown together in scenes like:

Co-running a small "Nagi-Shizu Bookstore" booth in Chapter 88.

Going to bookstores together in their private time.

Nano petting Shizuka’s head (along with Kurumi Haraga) in many panels.

When Shizuka’s smartphone is confiscated by her mother, Nano is the first to notice something is wrong and works with Rentarou to help.

Likewise, when Nano becomes parasitized by a fictional alien from a novel, Shizuka is quick to notice the change.

Meme Kakure

Meme Kakure is another first-year classmate who is shy and reserved.

Her timid nature meshes well with Shizuka’s, and they often spend time together, doing activities such as knitting.

Meme frequently hides behind Shizuka when she is scared or anxious.

Even when Meme temporarily turns into a baby, she instinctively crawls or waddles behind Shizuka for shelter.

Shizuka is considerate of Meme’s fearfulness and gives her a teddy bear doll ("Teddy Baby") when Meme is babyfied.

At one point, when Meme’s trademark bangs are in danger of falling away and revealing her face, she uses misdirection, startling Shizuka in the process.

In Chapter 120, Shizuka anticipates Meme’s tendency to vanish using misdirection and opens her arms to provide hiding space behind her.

Meme, instead of using misdirection, simply walks behind Shizuka and hides, creating a very wholesome scene of mutual understanding.

During a head-dress incident, Meme chooses to grab and hold Shizuka so she won’t be blown away, sacrificing her own hairstyle.

Conveniently, a head-dress flies in front of Meme’s eyes and preserves her signature look.

Meru Zetsubouda

Meru Zetsubouda is the author of the picture book "Yume-chan and the House in the Sky."

She meets Shizuka as a fellow book-lover and probes Shizuka’s desire to create.

Meru’s question, "Why do you not write, if you love books so much?" triggers Shizuka’s journey into writing.

From there, Meru acts as a mentor, reminding her that stories are not a contest and that everyone’s personal narrative matters.

Meru herself has been suffering from creative block, feeling that the overwhelming happiness of joining the Rentarou Family makes her own soft picture-book dreams feel small.

Shizuka’s earnest attempt to write, and her tears over it, end up inspiring Meru in return.

Later, the two often share a workspace in the library, crafting their stories side by side.

Editorial tags explicitly underline the theme: "Someone’s story saves someone else’s story."

Shizuka’s Mother

Shizuka’s Mother is a central figure in Shizuka’s trauma and later healing.

She appears first in flashback in Chapter 3 and then finally in the present timeline in Chapter 134.

She is frustrated and distressed that her daughter will not speak with her own voice but instead uses a book to communicate.

Her worry curdles into harsh discipline, including slapping Shizuka and calling her behavior "weird," which only deepens Shizuka’s fear and self-loathing.

Eventually, things escalate to the point where Shizuka’s Mother confiscates Shizuka’s smartphone, literally cutting off her voice.

This forces the issue into a crisis.

With the help of Nano Eiai and Rentarou, Shizuka is finally able to face her mother directly.

Using the app and her carefully chosen phrases, she tells her mother that she is terrified of speaking but still loves her and appreciates her.

Her mother realizes that her own fear for Shizuka’s future had turned into cruelty.

The two reconcile, crying together, and their relationship begins to heal.

Afterward, Shizuka is shown learning to cook with her mother, such as making rolled omelets.

In that scene, her lines about loving her mother’s cooking and being grateful for how she was raised are delivered smoothly through the app, symbolizing a new, more honest connection.

Shizuka’s Father

Shizuka’s father is mentioned in Chapter 135 but has yet to appear on-screen.

He works mostly overseas for his job and rarely returns home.

Because he is physically absent, his emotional presence in Shizuka’s life is limited in the story so far.

However, his distance reinforces Shizuka’s isolation at home, making her mother’s behavior even more impactful.

Uto Nakaji (the "Poet")

Uto Nakaji is the "chuunibyou" poet character who dresses and acts like a wandering bard.

Like Shizuka, she loves books and fantasy.

Her room contains all volumes of "Crown Love Story," suggesting she is also an avid fan of Shizuka’s beloved series.

When they dance together in a folk-dance event, Uto leads Shizuka in a ballroom-like manner, resembling a prince escorting a lady at a castle ball.

Their shared love of fantasy and literature gives them a quiet but strong bond.

Their scenes often highlight the whimsical, storybook side of Shizuka’s personality.

Hakari Hanazono and Karane Inda

Hakari Hanazono and Karane Inda are Rentarou’s first and second girlfriends, respectively.

Shizuka initially feels intimidated by them, fearing comparison—Hakari being glamorous and affectionate, Karane being sharp-tongued and dynamic.

However, both Hakari and Karane quickly assure Shizuka that she doesn’t need to hold back or feel lesser.

Once she understands that she is truly welcomed by them, she relaxes and opens up, becoming more integrated into the group.

Shizuka addresses them with polite suffixes ("-san" equivalents) out of respect.

They, in turn, dote on and protect her, especially when anything threatens her emotional safety.

Kurumi Haraga, Chiyo Iin, Kusuri Yakuzen, and Others

Shizuka tends to use polite forms of address for all other girlfriends, including juniors like Kurumi Haraga and Chiyo Iin.

This politeness underscores both her seriousness and her sense of distance early on.

Kurumi often joins Nano in petting Shizuka like a small animal.

Their combined doting reinforces Shizuka’s status as the "mascot" of the group.

Kusuri Yakuzen, who often appears as an eight-year-old due to failed immortality drugs, sometimes plays doll games with Shizuka.

Despite Shizuka being older in reality, Kusuri’s mental regression and Shizuka’s own childlike tendencies make them natural playmates.

In crisis scenarios—whether it is an out-of-control hair monster from Hakari’s sister, or mass chaos spreading through the family—Shizuka is typically the one people rush to protect first.

Her presence repeatedly acts as an emotional anchor for the entire Rentarou Family.

Shizuka is one of the more sheltered members of the Rentarou Family when it comes to explicit romance or sexuality.

Other girlfriends frequently shield her eyes during overly suggestive or risqué moments.

Kurumi Haraga even refrains from deep kissing Rentarou in certain situations, citing that it would be "educationally bad" for Shizuka.

This sets up a running gag where Shizuka’s innocence is treated as something to be protected.

However, Shizuka is not ignorant.

Her reading habit includes books with mature themes, including stories of adult relationships between women in professional hierarchies.

In one episode, she reads a novel featuring a "very adult" scene between a female boss and her female subordinate.

She blushes and struggles to decide with whom she should share her thoughts about it, only to discover that her younger sister (Mai Meido) has read the same book, letting them bond over it.

Shizuka is the only girlfriend who actually sees Rentarou’s naked body in full when the others attempt to peek at him bathing.

The shock causes her to nosebleed and faint, a classic anime reaction.

She also accidentally looks up Mei Meido’s skirt while searching for Meme Kakure during a misdirection incident.

Later, she happens upon an erotic exchange diary between Hakari and another character, reads enough to understand its contents, and turns bright red from embarrassment.

Despite all this, she harbors normal teen romantic fantasies.

Her dreams clearly show that she understands at least up to sharing a bed intimately with a lover.

Her personal desire to flirt and be close with Rentarou is clear, and once she feels secure, she proactively seeks kisses or cuddling.

Her supposed "innocence" is more about inexperience and embarrassment than actual ignorance.

Although Shizuka finds speaking extremely difficult, she can sing without issue.

This aligns with many real-world cases of stuttering, where singing bypasses some of the mechanisms that cause speech disfluency.

In a karaoke episode, she is initially terrified to sing in front of others, worrying she will ruin the mood.

Rentarou and the other girlfriends reassure her that they are not a "crowd" but her family.

Once she accepts this, she manages to sing in front of the entire Rentarou Family.

Her singing is overwhelmingly cute and moving, triggering a massive emotional reaction.

During a duet with Rentarou, Shizuka’s voice becomes so powerful (emotionally) that it creates a kind of "mental world" and literally blows the other girlfriends out of the karaoke room.

Rentarou, of course, manages to catch them all.

Later, when the Rentarou Family forms an idol group, Shizuka participates as a singing and dancing member.

An in-universe line from her via the app humorously describes herself as equipped with a "vocal performance function."

Shizuka is not a deliberate comedian, but comedy often happens around her.

Her extreme cuteness, frailty, and strange app-based speech make her an automatic trigger for gags.

Some recurring comedic motifs include:

Her being blown away by wind, sometimes using towels as makeshift gliders.

Large animals and even guard dogs instinctively protecting her as the ultimate prey creature.

Her jaw strength being surprisingly strong due to her small mouth requiring extra chewing, which leads her to dominate a tapioca eating contest with chipmunk-like intensity.

The family’s exaggerated overreactions whenever she is harmed or cries, such as awakening their "Super Iya-jin" state.

Her usage of bizarre or mismatched quotes for everyday statements, creating wild tonal clashes.

Despite her non-boke nature, her presence is so naturally cute that gags gravitate to her.

Several artists and fans draw her in animal-themed outfits or pajamas, often featuring rabbit or other small animal imagery.

Her role as "the most beloved small animal" extends even to meta elements, like side art or bonus illustrations.

Within the story, characters repeatedly comment on how inhumanly adorable she is.

Within Rentarou’s enormous polyamorous "family," Shizuka holds a very special place.

She is simultaneously the mascot, the emotional weak point, and an important straight man to the collective’s absurdities.

She is often the one to offer a sober, literary-style observation about another girlfriend’s actions.

Because her lines come from novels, her tsukkomi can sound like epic pronouncements or scathing noble insults.

As the family grows, her reactions become sharper, and she occasionally refers to them collectively as "our young mistresses" in a slightly exasperated yet affectionate way.

She also often steps in to cover for others when they say something insensitive, quickly correcting or smoothing over the situation.

Although Shizuka starts off isolated and self-loathing, the Rentarou Family’s acceptance slowly changes her.

She becomes more proactive, more willing to speak (even via app) and genuinely brighter and more energetic compared to her pre-story self.

At the same time, the family’s love for her is fierce and protective, and the narrative makes it clear that harming Shizuka is the fastest way to make every single girlfriend your enemy.

In that sense, despite being the physically weakest, she is one of the most untouchable and cherished members of the group.