In the wake of his mother's tragic death, fifth-grader Takuya Enoki shoulders the responsibility of caring for his baby brother while his father toils tirelessly. Juggling household chores, childcare duties, and the judgment of unsympathetic neighbors, Takuya sacrifices his own childhood to provide for Minoru. As he witnesses his peers revel in carefree moments, Takuya grapples with the challenges of adulthood thrust upon him. Despite the hurdles ahead, he embarks on a journey where he might grasp the profound essence of family amidst the hardships.