While her husband is absent, Rika falls into forbidden sexual intercourse with her brother-in-law, Kentaro. As her marital relationship cools down, she surrenders herself while resisting Kentaro's invitation. Rika's reason is disturbed to the point that she thinks it is an unforgivable act. Her sister-in-law and her brother-in-law who rubbed her attractive breasts and intersected densely many times from morning to night. The best time to keep seeking each other, a sense of immorality and euphoria mixed violently in the brain.
