A 5 year old Yuzuyu is left behind by her mother and now must live with her relatives. The eldest son, Kippei is appointed to watch over little Yuzuyu. Being popular with girls, his life changes drastically as he realizes his days become ever so busy with making lunches, walking Yuzuyu to the kindergarten, playing with her and even listening to her problems while Yuzuyu awaits for her mother's return.