Mami Miura, a petite and soft-spoken student at Houshou Private High School, navigates her surroundings with a timid exterior that belies a tactical mind. Prone to panic in perilous moments, she counterbalances this fragility by deliberately weaponizing her vulnerability, coaxing allies like Ayumi into safeguarding her through calculated appeals to empathy—or even strategic physical intimacy. Her innocent façade obscures a survivalist pragmatism forged during her turbulent past as a fading idol, where professional stagnation entangled her in coercive exchanges with her manager. These experiences harden her resolve to exploit power dynamics, even as she privately grapples with the ethics of such choices.

Initially marginalized by peers like Misuzu Jinno, who subjects her to humiliating torments, Mami gradually sheds her passivity as threats escalate. She pivots toward subtle defiance, coldly withholding support when Misuzu faces retribution and allying herself with stronger figures like Ayumi. Her survival tactics blend compliance and opportunism: she adheres to Mutsumi Oribe’s protocols for evading lethal insects while quietly prioritizing alliances that maximize her safety.

Later, Mami confronts her history with unflinching candor, disclosing the compromises of her idol career—a revelation that reframes her earlier manipulations as extensions of lessons learned in exploitation. This introspection underscores her complex resilience, a duality of fear and cunning that allows her to endure relentless adversities while cautiously testing the limits of her own agency.