The eldest son, Taro, and the second son, Kazuya, return to their family home. Taro's wife, Yoshie, and Kazuya's wife, Shizuka, also gather, and the family home becomes lively for the first time in a long time. Shizuka, who had consulted Taro about Kazuya's lack of a permanent job, was attracted to Taro. Meanwhile, Kazuya has feelings for Yoshie, who watches over him kindly. There is no way that such brothers can get along, and they even develop desires for each other's wives. Kazuya devours Yoshie in secret, and Taro secretly devours Shizuka... However, their secret affair under the same roof is soon discovered by both of them...