Three Koda sisters, 29-year-old Sachi, 22-year-old Yoshino, and 19-year-old Chika live at their grandmother's home in Kamakura, Japan.
When the Koda sisters were young, their parents divorced and they were abandoned. Not having seen their father in 15 years, they receive news of his death. Sachi asks her sisters, Yoshino and Chika, to attend the funeral where they meet 13-year-old Asano Suzu, their half-sister. Yoshino is aware that her father's widow, Yoko, is not Suzu's real mother and finds her to be unfit as a guardian. Concerned for Suzu's well-being, Sachi attends the funeral and invites Suzu to live with them, Suzu gladly accepts.
There are three sisters: 29-year-old Sachi Kouda (Haruka Ayase), 22-year-old Yoshino Kouda (Masami Nagasawa) and 19-year-old Chika Kouda (Kaho). They live at a house in Kamakura, Japanese. Their house was left by their grandmother.
One day, they receive news of their father's death. When the sisters were young, their parents divorced and their father left them. They haven't seen their father in 15 years. Upon hearing the news on their father's death, the sisters attend their father's funeral.
At the funeral, they meet their stepsister Suzu Asano (Suzu Hirose). She is 14-years-old and there are no one to take care of her. Oldest sister Sachi invites Suzu to live with them.