Tomonori is a freeter who still lives at home with no dreams. One day, his mother's friend Eriko, who has returned because her marriage life has not been going well, comes to visit. Tomonori confesses his feelings to be reunited with the person he has admired since childhood. Eriko gently rejects him, saying that he is just confused, but she is overcome by his sincere feelings and they end up having sex, with the promise that it will be just a one-time thing... Eriko begins to gently take the cock in her mouth, saying "I thought so... you are young," which is too much to be satisfied with just one time, and the promise is broken without any warning...