A terminally ill woman chooses to have a child and spends her final days embracing motherhood with courage and love.

Ito is a second-year high school student and an only child who has to move to a different city; her mother remarried and begins her new life as an older sister of 4 siblings! The start of a family-love-comedy with four step-brothers!

One day, taxi driver Koji Usami is tasked with driving 85-year-old Sumire Takano from Shibamata, Tokyo to a senior care facility in Hayama, Kanagawa. Sumire asks Koji to make some detours. Gradually opening up to her, Sumire begins to tell the story of her grand past...