A story about a sister-in-law and a brother-in-law. Sister-in-law, Ryoko Murakami, who lives with her husband Tatsuo's brother-in-law and his wife. Since Tatsuo was on a business trip abroad, his brother-in-law, Yasuhiro, found out that he was masturbating because he couldn't stand the sexless situation, and he crossed the line with Yasuhiro. Yasuhiro, who is about to be dominated by Ryoko's body, gradually develops a desire to control Ryoko. And by the time she realizes, serving Yasuhiro as a sex slave will lead her normal life... And after Tatsuo returns from his overseas business trip, Yasuhiro's demands escalate further...
