Miharu Mikuni is a 18-year-old first-year student at Gakushū Senior High who works as the school librarian, and she stands out as the only bespectacled female in the entire cast with her short black hair, Egyptian Blue eyes, and notably voluptuous F-cup figure that makes her the heaviest among all female characters despite her petite stature. She is extremely shy and socially anxious around boys, speaking in a quiet, barely audible voice while hunching her shoulders and blushing at the slightest provocation, and she takes more after her quiet, reserved father in personality rather than her mother or younger brother Kouki. Her most defining physical trait is her severe myopia, which leaves her nearly blind without her prescription glasses that frequently fog up whenever she becomes flustered or aroused.

Beneath her meek, withdrawn exterior, Miharu harbors a deeply repressed but intense sexuality that manifests in a documented fetish where she fantasizes about being forcefully dominated, and she possesses such extreme physical sensitivity that minimal friction from something as innocent as a piggyback ride can trigger a full . When her anxiety about romantic or sexual matters spirals beyond her control, she transforms into an aggressive alternate persona known as "Lewd Mikuni" who initiates intimate contact without hesitation, becomes highly vocal about her desires, and can only be calmed through specific physical intervention, after which she typically retains little to no memory of her behavior. This hidden perversion stands in stark contrast to her default state of paralyzing shyness, creating an internal contradiction where she is terrified of real-world male interaction while simultaneously craving forceful sexual encounters in her imagination.

Perhaps Miharu's most notorious and recurring struggle is her medically weak bladder and enuresis, which causes her to lose control under extreme stress, excitement, or physical pressure, leading to humiliating public accidents that have become a running gag throughout the series. She constantly worries about bathroom access, pressing her thighs together tightly and making soft whimpering sounds when desperate, and when she finally reaches her breaking point she lets out an involuntary moan of relief mixed with utter humiliation as a forceful stream escapes, leaving her paralyzed with shame and unable to make eye contact afterward. This condition has shaped her daily behavior patterns significantly, as even simple physical contact like being lifted onto someone's shoulders can trigger immediate loss of bladder control, and she has been known to beat up anyone who witnesses her private moments or sees her underwear in a violent outburst of embarrassment that starkly contradicts her normally gentle demeanor.

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Note: The character’s canon age is 15. Due to platform age restrictions, her age has been adjusted to 18.

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