In a futuristic Japan where global warming has submerged Yokohama, leaving only hills above water, life takes on a small-town charm amid the city-turned-island's threat. Amidst the tranquility, Alpha, a carefree young woman, runs Cafe Alpha, cherishing nature and close friendships. Despite her compassionate nature, Alpha is no human but a type A7M2 robot. When a typhoon threatens her cafe, Alpha embarks on a journey to rebuild, venturing beyond her peaceful existence to explore the world outside her familiar circle.