"Congratulations on your graduation, it's the same as five years ago..." It's been five years since I continued my sex friend with my son's friend Kitayama. - The trigger was five years ago when my husband was found out, Kitayama-kun comforted me with a gentle kiss as I was depressed. - I waited until the day of the graduation ceremony, with no desire to get in the way of Kitayama's entrance exams. - And in response to Kitayama-kun's feelings, we formed a physical relationship for the first time. - For the next five years, we kept meeting in silence from her husband and son, but our relationship changed after Kitayama-kun found a girlfriend...