Shiki Granbell is a young boy raised by robots on the abandoned Granbell amusement park. His encounter with Rebecca Bluegarden, a traveling video creator accompanied by her cat Happy, gives him the opportunity to leave his home world for the first time and discover the vastness of space. Determined to make friends and meet Mother, a mysterious entity regarded as the goddess of the universe, Shiki boards the Edens Zero. Together with his new companions, he travels across different planets, faces dangerous enemies, and gradually uncovers the secrets connected to his power, his past, and the strange legacy of the ship.