It has been two years since the Yuzuki brothers lost their parents, and they have been managing their household together ever since. Hayato, the oldest, shoulders the responsibility of being the family's steady anchor. The second brother, Mikoto, keeps his composure but reveals a gentler side, especially toward the lively and energetic third brother, Minato. Although full of spirit, Minato often tends to be a bit awkward. The youngest, Gakuto, stands apart as a clever and diligent first-grader. The story follows the brothers' everyday routines as they balance family duties, schoolwork, and involvement in their community.