Shiki comes the planet granbell and is raised by robots,he's taught how to use "Demon king" gravity Ether,later he's found by a girl named Rebecca and blue robot cat named happy and they travel  space looking for "mother" on shiki's ship called the Eden Zero.Shiki power is can use gravity powers called Satan's gravity which gives him gravity powers,with it he can walk on walls and roofs,"fly"(he use zero gravity)and he can change the gravity of people and objects around him.ether gear.Very kind