Tarou notices his wife, Misako, becoming increasingly beautiful, only to discover the secret behind her glow: a passionate affair. Rather than seeking a divorce, Tarou finds himself unexpectedly aroused by her infidelity. He strikes a clandestine deal with her lover to receive recordings of their encounters, sparking a dangerous sexual awakening that leaves him torn between hatred and an uncontrollable new desire.
Misako continues her clandestine affair with her ex-boyfriend, Kuroda, indulging in risky encounters that contrast sharply with her image as a devoted wife. The betrayal reaches a peak when she brings Kuroda into her own home on her wedding anniversary. However, the thrill turns to horror when Tarou reveals he has been watching all along, irrevocably shattering Misako's carefully maintained facade.