A masochistic tendency has been born. "I want it to be after school soon... I want to be trained more vigorously...!" One day, Shuuka, a beautiful girl living an ordinary student life, sees a nude photo of a girl on the blackboard and is intrigued by her lewd appearance. Meanwhile, she hears a rumor from a classmate. There is a secret club at this school called the "After School Training Club" where female students are tied up and trained for pleasure. Shuuka, who has never heard of it before, steps into the world of bondage and training, and applies to join.
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