During a long holiday, family members gather at their hometown. Brothers Ginji and Hiroshi, along with their respective wives Miwa and Misa, spend time together with their father-in-law, Kiyoharu, who has recently begun showing signs of dementia. While the family worries about him, they enjoy a relaxed holiday atmosphere. Yet beneath the surface, complicated emotions swirl. Hiroshi harbors feelings for his brother's wife, Miwa, while Misa finds herself drawn to Ginji. Amid this tension, a small action by their father-in-law begins to shake the fragile balance of their relationships.