The story of two sets of mothers and sons. Tatsuo Igara, a nephew who lives alone while attending university in the Tokyo metropolitan area. For home renovations, his cousin Yasuhiro Shio and aunt Yuriko Shio are staying at his aunt Shinobu Igara's house, which is Tatsuo's childhood home. One day, Tatsuo returns home but cannot suppress his sexual excitement towards his own mother with a nice ass, ultimately engaging in sexual intercourse with her multiple times after obscene fantasies. At the same time, Yasuhiro also engages in sexual intercourse with his own widowed mother. The two sons who witnessed each other's incest decide to execute some obscene plan...
