Miki, a wife, has been living with her mother and son for a long time because her husband is away on business. She originally had a stronger sexual desire than anyone else, so she suppressed herself by letting it out through masturbation. However, her son Junpei, who is seduced by the sex appeal that oozes out from the oppression, can't stand the relationship between mother and son and pushes her down. Since then, Miki has been living a secret love life, but his brother-in-law, Tatsuyoshi, finds out. An angry Tatsuyoshi said, ``I'll punish you.''