The eldest son, Toru, and the second son, Hiroshi, return to their hometown to celebrate their parents' golden wedding anniversary. Toru's wife, Yumi, and Hiroshi's wife, Suzuka, also gathered and their parents were happy. However, Hiroshi had liked Yumi for a long time, and was on bad terms with Toru, who had a cold attitude towards Yumi. Suzuka, who can't deal with Hiroshi, is also dissatisfied. Hiroshi hides from Toru and approaches Yumi, while Suzuka appeals her dissatisfaction with Hiroshi and seduces Toru. The couple secretly exchanges and is indecent. Finally, the four of them run into each other...
