Miho married her husband, who was her classmate in college. One day, she attends a class reunion and meets her ex-boyfriend Kozuka. Meeting him again after such a long time makes her feel the same excitement she felt when she was younger, but Miho doesn't want to ruin her current life, so she treats him as a friend. But Kozuka is not like that. He has not been able to forget about Miho, and when her husband is not around, he comes to her house and asks for a relationship. Unable to refuse, Miho feels guilty, but she can't help but feel excited by the cock of someone other than her husband, which she hasn't felt in a long time...