Sensei, may I ask you to tie me up tightly again today? A troubled female student, Nazuna, learns of the existence of a secret SM club at her school. Out of curiosity, she decides to peek into the world of SM. Through her experience as a slave, she frees her masochistic side, and before long, she becomes immersed in that world every time after school comes around... A club activity for female students who dedicate their youth to SM. Includes bondage, spanking, toy torture, deep throating, whipping, candle training, and restrained sex.