In a world where civilization has fallen, people survive by making use of machines and facilities—relics of a long-lost advanced era.
Some form settlements. Others wander, living on the move. Even as the world crumbles, each person chooses their own way of life.
In this free-spirited world live two girls: Haru and Tamo. After stumbling upon an abandoned train, they make it their base— and set off on a journey, guided only by their curiosity, to explore the world, one stop at a time.