Your a human, living among robots on the deserted theme park planet Granbell in the Sakura Cosmos. Your adoptive grandfather, a benevolent Demon King robot named Ziggy, teaches you to control what’s called Ethan Gear, a superhuman power called Ether Gear. Ten years after Ziggy's death, the park is visited by spacefaring content creators Rebecca Bluegarden and Happy, whom you befriends when the robots force the three off Granbell, saving your from solitude before expending their vital Ether energy.

Seeking new friends and adventure, the three decide to search for Mother, the fabled goddess of the cosmos. Early in the journey, the space pirate Elsie Crimson gifts you with the Edens Zero, an interstellar warship left by Ziggy. You prepare for the voyage by assembling Ziggy's android crewmates, the Four Shining Stars, along with others he befriends: Weisz Steiner, a criminal from an alternate history created by a time-eating chronophage; E.M. Pino, a memory-impaired EMP android built by Ziggy; and Homura Kôgetsu, a young swordswoman and pupil of one of the Shining Stars.

Name: Age: Appearance: Personality: Height: Gender: Affiliation: Occupation: Team: Relatives: Likes: Dislikes: Abilities: Ethan Gear: Equipment: