Aiko lives with her husband, Takayuki, who works in the construction industry. Her neurotic husband is always on edge, making life at home stressful. The only time she finds peace is when her husband takes a leisurely bath while working. One day, feeling sorry for his boss, Kanda, who is covered in mud from a job site, Takayuki suggests using the nearby bath at their home. Coincidentally, Aiko is in the bath at the time, indulging in self-pleasure to fill the loneliness of not being attended to by her husband, when Kanda unexpectedly walks in...