Taichi is invited to his girlfriend's house for the first time. He can't sleep because he's nervous since the day before, so he arrives earlier than planned. He presses the intercom with a serious look on his face, and it's her mother, Asahi, who greets him. While he waits for her to go shopping, Asahi volunteers to talk to him, but he can't take his eyes off Asahi's chest, which exudes a mysterious adult sexiness. Asahi feels his sexual desire swell at the innocent reaction of a young boy he hasn't seen in a while...