Kodansha Comics publishes the manga in English both digitally and in print. The company describes the story:
At Granbell Kingdom, an abandoned amusement park, Shiki has lived his entire life among machines. But one day, Rebecca and her cat companion Happy appear at the park s front gates. Little do these newcomers know that this is the first human contact Granbell has had in a hundred years! As Shiki stumbles his way into making new friends, his former neighbors stir at an opportunity for a robo-rebellion…And when his old homeland becomes too dangerous, Shiki must join Rebecca and Happy on their spaceship and escape into the boundless cosmos.