In a near-future Japan, rising sea levels from global warming have submerged the sprawling metropolis of Yokohama, leaving only its hills poking above the waves. What was once among the nation's largest cities has dwindled into what feels like a modest coastal town. The very existence of this island country hangs in the balance. Yet there is no trace of despair, ruin, or hopelessness in the air. The people live unhurried, easygoing lives, cherishing one another's company and savoring the tranquil, unhurried passage of time.
That is especially true for Alpha, a lighthearted young woman who runs a little establishment called Cafe Alpha. She finds joy in losing herself in the lush, unspoiled scenery around her, and nothing brings her greater happiness than spending meaningful moments with her gentle-hearted friends. The warmth and contentment she radiates might suggest a deeply compassionate soul—but she is not quite human. In truth, she is a type A7M2 robot.
One day, a radio broadcast warns of an approaching typhoon. A close friend living nearby, who runs a gas station, calls her over out of concern that her aging cafe may not survive the storm. And indeed, when the typhoon passes, it leaves Cafe Alpha badly battered. With her beloved establishment in ruins, Alpha makes a decision: she will set out on a journey, both to raise funds for rebuilding her cafe and to see the wider world beyond her friends and the comfort of her peaceful existence.