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Konta, a young baker, runs Hotaru Bakery, a remote mountain shop accessible by cable car, where he crafts natural yeast breads. He encounters Mamita, a stranded alien child searching for food after a spaceship crash, and impulsively invites him to stay as a “younger brother.” Mamita, resembling a fourth-grader but with mature intellect, adapts to life at the bakery, charming customers while bonding with Konta over baking. Their daily routine involves tending to the shop, perfecting recipes, and navigating the quirks of their makeshift sibling dynamic. The arrival of Tamaki, a curious visitor, and interactions with locals like Goro and the cat Mon-chan enrich their peaceful, flour-dusted days.