Ai is ambushed by her homeroom teacher on her way home from school. Under the pretext of supplementary lessons, he follows the teacher's house without any doubt. Without realizing that the tragedy of a high school girl began... When he wakes up from a coma by drugs, he is tied up and deprived of his freedom. He is played with plenty of things and becomes captivated by the rope. The prank continues even at school... and turns into a slave to the men on campus.