FNS-199 - Preparing for the cultural festival, playful antics with classmates. The rope marks from playfully bound handcuffs trigger a D/s switch - after writhing and moaning, a masochistic awakening. From that day on, we become addicted to a secret SM game that we must hide from our classmates... Yoda Rin.

During cultural festival preparations, playfully binding Rin's hands triggers a hidden D/s switch. She wets her underwear and experiences pleasure from the rope marks and the feeling of being restrained. From there, the two of them begin a secret SM game in various places - 'A secret we can't tell anyone' - deceptive sex with a classmate.