On the abandoned theme park planet Granbell, a boy named Shiki has lived his entire life among robots. His world changes forever when he meets Rebecca, a "B-Cuber" video creator, and her robotic cat Happy. After the robots on the planet drive them away to save Shiki from a lonely life, the trio sets off into the Sakura Cosmos. Inheriting the legacy of his grandfather, the Demon King Ziggy, Shiki becomes the captain of the interstellar warship Edens Zero. Their mission: find "Mother," the legendary goddess of the universe who is said to grant any wish. Along the way, they must navigate space-time ripples, ruthless intergalactic criminals, and the mystery of Shiki’s own gravity-based "Ether Gear."