Nanami is blackmailed by her apartment manager after he discovers her affair. Driven by intense possessiveness, he forces her to wear a chastity belt. As her pent-up desire grows under this control, she begins craving the manager's sexual demands more and more. The moment the chastity belt is removed, her suppressed lust erupts uncontrollably, plunging her into overwhelming pleasure. This intense, impulsive experience profoundly shakes both her mind and body.