Umi Sayama is a high-school girl whose life takes an unexpected turn when her mother goes on a long business trip and entrusts her to the care of the neighboring Hiroi family. The household she moves into includes Shōya, a man eight years older than her, whom Umi once looked up to. But on reunion, she finds that the Shōya she remembers is different from the one greeting her now — and thus begins a quietly glittering co-habitation story of changed memories and new connections.
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