Recently, Jun had been spending a lot of time at his girlfriend Izumi's house. It saved him money on meals and also helped him save on hotel costs. More than anything, he got to see Izumi's mother, Haruka. Each time he visited, he was captivated by Haruka's mature allure, a seductive charm that Izumi lacked. However, these days took a significant turn when Jun accidentally witnessed Haruka masturbating. The relationship between Jun, Izumi, and her mother Haruka developed into a strange triangular relationship where maternal love and sexual impulses clashed...