Kangoku Jikken

Eyama Aito, a secondary school understudy, is the casualty of day by day harassing. One day a weird letter arrives welcoming him to a "bondage diversion." He may pick one individual to hold hostage for multi month with a shot at winning a lot of cash. He picks the instigator of his harassers, Aya Kirishima, and the main control of the amusement is to not execute her. Everything else is reasonable diversion. Eyamas retribution starts!