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, she becomes unable to resist her temptations... ``My sister is having an affair while traveling anyway...'' Still, her rationality is blown away to the point where she thinks it's no good. Day, evening, night, and the next morning, I repeatedly have intense sex with Ichika, who is much more erotic than my girlfriend's 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...