A female student is tied up in a warehouse for training. Since her mother's death, her stepfather has changed, training her with ropes. An innocent body begins to experience pleasure from pain and suffering. (Hikaru Natsuki GAJK-022)

Hikari is overwhelmed with grief after her mother's sudden death. Even after remarrying, her stepfather, who had always treated her gently, began to act strangely, making life even more difficult. One day, Hikari accidentally angered her stepfather. He yelled, "This needs training!" and took her to the warehouse, tied her up with rope, and assaulted her. From that day on, a period of "training" began under the guise of discipline. As her rationality numbed, she began to accept abnormal pleasure…