Ruriko's beauty and seductive charm drive his son's friend, Kenji, crazy. Kenji secretly admires Ruriko, so he starts coming over to their house more and more often to see her. When he finds out that his son comes from a single-parent household, he finds it even more difficult to control his sexual urges towards Ruriko. Kenji ends up breaking into Ruriko's bedroom and rummaging through her underwear. He then finds a vibrator in the dresser that shows signs of having been used. "Auntie, you use something like this..." Kenji realizes that Ruriko is sexually frustrated, and finally...