Yuka, a friend of his mother's, is staying at the Kashiwagi household to watch a live performance by a popular Korean star. Her son, Junkichi, who has always admired her, is looking forward to her arrival. That night, while he is taking a bath, Yuka, tipsy and in a good mood, comes into the bathroom completely naked... Junkichi is unable to contain his excitement at the pleasure of being washed by Yuka, and he ends up kissing her. Of course, that's not enough, so in the middle of the night, Junkichi sneaks into Yuka's bedroom...