sin is a manga about a brilliant man who figures out that the earth is just a small part of whats really out there and that space is too, he finds out that there are diffrent directions that are called planes, while hes working on finding ways to go there some one mysterious comes out of his portal that hes making and kills him. His son takade kinshin finds his fathers work and gose into the 5th plane called the soul plane.
there are 9 known planes and they are each like deimensions planes are flat surfaces that go on side to side for ever, the planes from 1st to 9th known are reincarnation,heaven,space(earth is some where there),middle plane,soul planedemon plane,belzabuls domain,deaths domain,hell.
Ok ok, this can work. It's actually not a bad idea. Looking forward to hearing more for what you can come up with. To tell you the truth, I wouldn't mind drawing it although I'm working on a separate project.