After arguing with her husband, Sachiko, the mother-in-law, rolls into her daughter's house. After drinking alcohol and venting to her daughter and son-in-law, she falls asleep. Despite noticing his mother-in-law's voluptuous body, the son-in-law carries her to the bedroom. Sachiko half-jokingly says, 'Help me take off my clothes,' tempting him. The son-in-law gets an erection seeing her bra-less chest, and upon noticing this, Sachiko becomes happy, continuing to tease and tempt him afterward. One day, when his wife goes out for a girls' night, the two of them finally have sex…
