The story of two pairs of mothers and sons. Tatsuo Kiyono lives alone while attending a university in the city. For home renovations, his cousin Masaru Fujibuki and aunt Harumi Fujibuki are staying at Tatsuo's mother Fumie Kiyono's house, which is also Tatsuo's childhood home. One day, Tatsuo returns home as planned but cannot control his sexual arousal towards his mother, leading to multiple instances of intercourse and internal ejaculation after obscene fantasies. Around the same time, Masaru begins to see his own mother Harumi Fujibuki as a woman and struggles with inner turmoil.
