Hiroshi was enchanted at first sight by this beautiful and sexy woman, who was hard to believe was his mother's friend. On the day the family was going out, Hiroshi had caught a cold, and Yui had come over to look after him, concerned about him. Yui up spending time alone with the beautiful woman who had unexpectedly turned up, and his parents were not there. Excited by this rare opportunity, Hiroshi stares intently at Yui's entire body. As is typical of young people, he runs around aimlessly. However, sensing the glaring gaze of the woman, who is clearly still a virgin, Yui takes an unexpected action...