OBA-235 A married woman named Kyouko Hattori invites her lover to her home and indulges in sex while her husband is away.

It's been a few months since my husband and son, Shinichi, started to get hooked on sumo wrestling, and this Saturday we were supposed to go to a sumo wrestling match together. Then, on Saturday, her husband and Shinichi go to a sumo wrestling match, leaving Keiko alone. A few minutes later, a young man comes to the house. The man's name is Tanaka, and he had an acquaintance with Keiko at his part-time supermarket. And until her husband and her son come home, a day of starts from that moment...