When Rikaru Nakata's mother's illness becomes overwhelming, her family decides to leave their home in Kyoto and move in with their grandparents for support. After a long six-hour drive, they finally reach the bustling city of Tokyo. Ever since Rikaru found out about her mother's condition, she has been growing more distant from her family. The stress of her mother's health and her own personal struggles have made her worry that she has never made her mother proud, unlike her twin sister Hikari, who seems to excel in everything she does. However, now that her mother has received a terminal diagnosis, Rikaru is desperate to find a way to prove her worth before it's too late.