When her nephew Toshio comes to Tokyo to look for a job, his aunt Yayoi is excited to see him again after such a long time. Toshio has become more manly than she expected, so Yayoi can't help but tease him and try to take a bath with him, but he reacts as if he has no experience with women, which Kokoro Yayoi even more. Yayoi then purposely doesn't wear shorts and tries to show them to Toshio. She masturbates in front of him, teasing him and saying that she will steal his first kiss, arousing his lust. However, it was only a momentary lapse of judgment, and Yayoi comes to her senses, but her virgin sexual desire is not going to stop...