Aki Sasaki is threatened and raped by her son's university alumnus. Her husband, who witnesses the scene, heads toward the room where the man is, but ever since the alumnus moved in next door, Aki's life has gradually begun to unravel. One day, her husband finishes work early and returns home, only to catch Aki deepthroating the neighbor's cock, sending him into a rage. Desperate for answers, he interrogates Aki, then loses control and storms into the neighboring room. However, he is suddenly punched, knocked unconscious, and when he wakes up, he finds himself bound and immobilized. Before his eyes, his trembling son watches as his wife Aki is gang-raped by the men—yet amid the violation, she appears to be deriving pleasure from it.