Grandma passed away. For "Hiyori-chan," an elementary school girl who cried every day, her papa built a grandma-type robot named "Wasimo." The nostalgic *clack-clack-clack* sound heard when Wasimo walks is because it uses the same dentures as Grandma. Its walking speed is faster than a snail but slower than an excited rhinoceros beetle. But actually, it can run faster than a bullet train. This oddly-spec'd "Wasimo" meets various people and has all sorts of experiences... The cute, fun, and slightly unusual daily life of "Wasimo" and "Hiyori-chan" begins!