The story of two pairs of mothers and sons. Tatsuo Makibara, a son who lives alone while attending university in the Tokyo metropolitan area. Due to some adult arrangements, his aunt Hitomi Tsurugi and her son Yasuhiro Tsurugi are living at his mother Azusa Makibara's house, which is also Tatsuo's childhood home. One day, Tatsuo returns home with his girlfriend as planned, but he cannot contain his sexual arousal towards his mother, leading him to engage in multiple acts of intercourse after numerous lewd fantasies, leaving her aside. At the same time, Yasuhiro forces his mother Hitomi to wear lewd clothing every day.
