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Alpha Hatsuseno, an android, manages a small café south of Yokohama in a world where rising sea levels have submerged coastal cities. Her days are spent tending to the café, awaiting her absent owner, and interacting with occasional customers. Alpha forms a bond with Kokone, another android who delivers a camera, prompting her to explore the surrounding countryside. She befriends local residents, including a kind grandfather and a curious boy named Takahiro. Her journeys on a scooter reveal a quiet landscape marked by remnants of a past civilization. Through these encounters, Alpha engages in simple activities like shopping trips and conversations, reflecting on her surroundings.