Rin-chan calls a teacher who is on a teaching internship into the classroom after school. She hands him a letter, thinking it's a love confession, but inside is a message saying, "Are you a virgin, teacher?" Then her expression changes from solemn to provocative, grinning, and forcing him to masturbate... This is the beginning of a master-slave relationship between a devilish schoolgirl who demands service wherever she goes, and a virgin teacher who has become a submissive masochist!