Masami, an ordinary housewife, lives with her husband Kenji, who is suffering from impotency. Because of this, their nighttime activities are lacking and she takes out her sexual frustration on Kenji. One day, Kenji's former boss, Oshima, visits her. Masami is shocked when he confesses about a previous loan her husband left her, and Oshima demands that she repay it with his body, and they finally cross the line. While Masami is overcome with guilt, she writhes in agony at Oshima's sexual play.