A young couple Aki and Kazuo are snatched off the street while having their first date as a romantic couple after a few years working in the same office. They wake up shackled in a basement that has plastic-covered walls. With no further explanation, a sadistic madman degrades, tortures and mutilates them. He punctures Kazuo's belly with a screwdriver and slices his tongue, drives nails into his scrotum, then sexually assaults the girl, forcing the other to watch. Sometimes, he stops the torture to provide medical assistance and cure the couple's wounds, so they can continue alive for a long period of time. This way, he cuts off all their fingers, makes collars with them, pops out Kazuo's right eye, removes the girl's nipples and cuts off her right arm.