FNS-199 Playing Pranks With Classmates In Preparation For The School Festival.The Masochistic Switch Is Turned On By The Biting Of The Rope Of The Shackles That I Tied Up As A Prank. After Struggling With My Lower Back, I Wake Up As A Masochist.From That

Film Introduction

During the cultural festival preparations, a classmate Rin's hands were tied as a prank, turning on her hidden M switch. She soaked her underwear with the rope digging in and the feeling of restraint, experiencing pleasure. From then on, the two engaged in secret SM play everywhere — "Can't tell anyone" sex education between classmates.