In the dimly lit corridors of an abandoned school, Kiriko stands defiant after overpowering two of her masked pursuers, leaving them sidelined in the nurse's office. The remaining assailants, undeterred by her threats to involve the authorities, propose a calculated wager to prove her unbreakable will. As their calculated advances test her limits over the agreed interval, the martial artist's sharp focus begins to dissolve amid rising waves of involuntary sensation, drawing her deeper into an unforeseen struggle.