One day, he is contacted by his former high school teacher, Miyako, who is looking for someone to tutor her daughter, Kasumi. Since he always had a huge crush on Miyako, he decides to accept her request, whilst keeping his inner feelings hidden.

The mother and daughter pair are thrilled that the talented tutor will regularly be coming, but they have secrets of their own. Lately, Miyako has been sexually frustrated, and Kasumi, who has no experience, has been hiding a growing interest in sex.