While his wife was away traveling alone, he had a forbidden secret meeting with his sister-in-law Ichika... As the relationship between the couple grows colder, he becomes unable to resist her temptations... ``My sister is having an affair while she's on a trip anyway...'' Even so, the more she thinks it's no good, the more her rationality is blown away. Day, evening, night, and the next morning, I have intense sex with Ichika, who is much more erotic than my wife, and cum over and over again. The best moments we continue to seek for each other. I want to stay connected forever. It felt so good that my head melted with a sense of immorality and euphoria...