It's been six years since Mariko started her housekeeping service. She has been dispatched to various homes, and this time she visited the Tabuchi family, whose son, Shota, is a shut-in. The house is filled with tension due to the delicate family environment of a single father and son household... A few days later, Mariko senses something strange when she sees Tabuchi arguing with Shota, so that night she talks to him... She finds out about Tabuchi's twisted sexual habits and true nature, and is helplessly seduced. Mariko is troubled and unable to tell anyone, but...