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Brothers (older brother Ginji and younger brother Hiroshi) and their wives Miwako and Misa gather at their parents' house over the long holiday. Their father-in-law, Kiyoharu, lives at the house, but he has recently begun to suffer from dementia, so they have gathered here out of concern for him. Although the couples spend the holiday relaxing, behind the scenes, each of them is engaged in a mixture of feelings as a man and a woman. Hiroshi continues to have feelings for his brother's wife, Miwako, while Hiroshi's wife, Misa, is attracted to Ginji. The couples have repeated affairs, but the father-in-law's sudden actions expose their relationship...