Aya and Nanako meet at a women-only SM club. Aya, who is a customer, liked M's Nanako and frequented the SM club. As they play more and more, they become attracted to each other and start dating. She understands that Nanako will play with other customers, but she loses her loneliness and finds out to Nanako that she also went to another SM club. Nanako humiliates Aya by reversing the roles of S and M, and by playing Aya. She gradually escalates and her body and mind are bound by Nanako.
