In near-future Japan, global warming has flooded the large city of Yokohama, and only the hills remain above the ocean surface. What used to be one of the largest cities in Japan is now reduced to the size of a small town. And even the remaining mountains, sticking out of the water as islands, seem to be in danger of going under. However, there is no feeling of desperation, nor hopelessness. People are enjoying laid-back lives, and they seem to appreciate each other's company, enjoying the quiet and peaceful time together.

This is especially true for Alpha, a carefree young woman, who runs a café named Café Alpha. She enjoys her life, immersing herself in the beautiful nature all around her. There is nothing more precious to her than spending quality time with her kind friends. Her joy of life has all the markings of a compassionate human being, but she is not quite human. She is actually a type A7M2 android.

One day, hearing a radio forecast warning of an approaching typhoon, her old friend who lives close by, invites her to the gas station he runs, worried that her old café may not withstand the typhoon. Indeed, the passing of typhoon leaves her café severely damaged. She then decides to go on a journey to raise money to rebuild her café, and also to see the outside world, away from her friends and the comfort of her peaceful life.

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Prequel: Yokohama Kaidashi Kikou