Shun and Nagisa first meet and fall in love during high school. However, despite strong feelings, they go their separate ways. Years later, Shun is now living alone in a rural area when Nagisa arrives with his six-year-old daughter, Sora.

Mari and Humi learn from their mother that their father has dementia on his 70th birthday. They help prepare their mother for his farewell and prepare themselves for the emotions to follow.