The ordinary housewife Yami lives with her husband Kenji, who struggles with impotence. As a result, their nightly activities have become scarce, and Yami vents her sexual frustration on Kenji. One day, Kenji's former boss Oshima visits them. He confesses to Yami about the outstanding loan that Kenji left behind, shocking her. Oshima then demands repayment in kind, and they ultimately cross the line. While Yami is torn by guilt, she also finds herself writhing in response to Oshima's sexual advances.
