Ayaka lives with her husband Takayuki, who works in construction. Her high-strung husband is constantly irritable, leaving her unable to relax even at home. Her only peaceful moments come when she can soak in the bath while he is away at work. One day, Takayuki sees that his boss Kanda is covered in mud from the job site and offers him the use of their nearby bathroom. Ayaka happens to be bathing at the time, masturbating to ease the loneliness of being neglected by her husband, when Kanda walks in on her...