Miho married her husband who was her classmate at university. - One day, she decides to attend a class reunion, where she meets her ex-boyfriend Kozuka again. - Miho feels the excitement of her younger days when they meet for the first time in a while, but she doesn't want to ruin her current life and treats him as a friend. - However, Kozuka was not like that. - Unable to forget about Miho, he took advantage of the time when her husband was not home and visited her house, asking for a relationship. - Miho couldn't refuse it, and though she felt guilty, she felt like she was experiencing a cock other than her husband's for the first time in a while...