Ai Kiriya, the silver-haired and silver-eyed third daughter of the Kiriya clan, carries herself with quiet reserve, her calm stoicism masking a tendency to keep others at arm’s length even during moments of intimacy. Her vampiric lineage grants her a mutagenic bite that triggers unpredictable physiological transformations in victims, a trait that anchors her narrative to themes of bodily mutation and psychological unrest, evoking tonal parallels to gothic and existential horror.

Born into a vampire dynasty ruled by her mother Sumi, Ai navigates a cutthroat succession plan steeped in manipulation and covert familial warfare. The clan’s survival hinges on recruiting male donors, though prolonged exposure to their bite corrodes both body and mind. While her sisters wield overt ambition, Ai’s introversion positions her as an unwilling participant in Sumi’s schemes, her internal struggles contrasting their external dominance.

Her central route in the visual novel dissects the repercussions of her mutagenic power, probing her fractured psyche and the collateral damage of her existence. Though spin-offs and adaptations remain unexplored, her arc crystallizes the clan’s broader conflicts—escaping Sumi’s shadow, sisterly rivalries, and the toll of their vampiric curse—all refracted through her mutations and emotionally guarded interactions.