Husband Takayuki works in the construction industry, constantly stressed and on edge. Their marriage has become defined by his demanding job, leaving Ayaka feeling increasingly lonely at home. For her, the only solace comes during bath time, when Takayuki occasionally relaxes and unwinds. One day, out of concern for his muddy supervisor Kanda after work, Takayuki invites him to use their home bathroom. At that moment, Ayaka is already bathing, indulging in masturbation to ease her loneliness and emotional neglect. Unexpectedly, Kanda walks in and witnesses the scene, setting off a new chain of events.