Rin has come back to her husband's parents' house in the middle of summer. But her father-in-law has been hospitalized, and her husband is so busy with work that he doesn't pay her any attention. Then she meets her neighbor, Sakamoto, and heads over to his house for a walk... Interested in his innocent reaction, Rin opens her sweaty chest... The virgin Sakamoto can't help but push her down. He started out joking, but then got serious and his reckless caresses make Rin cum again and again. And during their visit, the two of them continue to have a passionate, sweaty encounter...