The first time he experienced sexual pleasure was because of a rope. The pain and misery of being tied up makes him a masochist. His obscene body becomes sensitive when tied up tightly, and wets when humiliated. Mahiro peeps at his mother and stepfather having SM sex. Seeing the ecstatic expression on his mother's face while tied up, Mahiro becomes interested in bondage and masturbates. His stepfather scolds him for peeking while his mother is away and punishes him. This is the start of his training, and Mahiro falls into the role of a rope slave.