On his way to work, Shigeru gives directions to a woman who has lost her way. When he gets home after work, the woman he gave directions to is still at home for some reason... His mother then introduces him to her friend, Sumika, saying, "I told you my friend was coming to stay." Shigeru's heart starts beating fast when he sees Sumika's beauty, which is hard to believe for a classmate of his mother's... Excited and unable to sleep, Shigeru leaves the room and accidentally witnesses Sumika masturbating. Excited by her lewd behavior, Shigeru pushes her down without thinking...