Mitsuaki, a man who can’t get upset, secretly had a desire for his beautiful sister-in-law, Natsuki. One day, Mitsuaki, who came to the sea with his brother who runs a company on a company trip, sees Natsuki being raped by a rape addict in the bathroom behind the beach. The rape demon, Ansai, appears in front of Kosho as the days of agony pass. Using the position of Mitsuaki, he was aiming to commit Natsuki again … And finally Natsuki falls into the trap of Ansai and Kosho. The extreme insults and trainings eventually made Natsuki a captive of pleasure and drowned …