In Tokyo, a single mother and her four children, each with a different father, live together in a small apartment without formal education. When their mother finds a new partner, she leaves them alone with a limited amount of money and tasks her eldest son, Akira, with caring for his siblings.

Nobody Knows
A 12-year-old boy takes on the responsibility of caring for his younger siblings in a small Tokyo apartment after their mother's unexpected departure, leading to a journey of self-discovery and growth.