Mori, a child found by a rescue team in an abandoned house, wakes up in a shelter. While adapting to an unfamiliar life, one day, he begins to be looked after with unconditional love from a mysterious sponsor... And then Mori learns about the existence of a "mom" when a close friend leaves with hers. The child starts to wonder about the sponsor: "Could this person... be my mom?" This is the story of Mori's long and challenging journey to find his mom.