Neglected by her husband and suffering from a sexless marriage, married woman Nao found herself emotionally and physically distressed. One day, her brother-in-law, preparing for the bar exam, had to leave his hometown and temporarily move in with her. Overcome by loneliness, Nao began fantasizing about intimate encounters with him, masturbating every night. One day, her brother-in-law accidentally discovered her in the act. Having spent all his time studying with little physical release, his suppressed desires overwhelmed his rationality, and he moved closer to her. Initially resisting, saying it would be unfair to her husband, Nao could not withstand his aggressive advances. Excited by a man's touch for the first time in ages, she soon crossed the line herself. Between the two, a new relationship forms—one that helps them both escape the struggles of daily life.