This is Yumi Arima's first bondage work! Her innocent body is bound and stretched to its limits! A series of training sessions transform her into an even more masochistic woman. "Three months since transferring schools, I've managed to fit in with my class, but I still feel restless every day... Do I have too much experience, or am I a freak? My classmates just don't understand my kinks... I spend my days masturbating while reading SM erotic manga. One day, I saw my homeroom teacher entering an SM club. "So the teacher is into SM too..." I asked the teacher, "Please train me."