Eight years ago, Shoko, who abandoned her family and eloped with another man, has returned. Her son, Satoshi, is filled with anger and a dark desire. "Now I'm going to make you feel the pain I've endured for the past eight years," Satoshi says, tying up Shoko and tormenting her. The forbidden sexual encounter between mother and son escalates day by day. Meanwhile, her husband, Yukio, who has been unable to forgive his wife and embrace her, is tied up by his son and cries out in pleasure...