Okay. Sure. First of all the Toaru universe is layered with multiple dimensions inside of it. There is no parallel universes either, just one universe. These dimensions are called phases, they contain the Gods of myth and their homes. (Heaven, Hell, Olympus) With gods of different religions existing in different phases, so there’s a separate phase for heaven and a separate phase for hell. In Old Testament 4 Tsuchimikado explains that Phases exist on different frequencies like high and low radio waves, which means that beings that aren’t attuned to those phases can’t sense these phases or these phase beings. (An example brought up in OT 4 is that God could sit right next to a human but that human even wouldn’t be able to sense God because he isn’t attuned to Heaven, or a Demon and Angel could be right next to each other and never know because they aren’t attuned to each other’s phases. It’s only in the human realm there able to interact which each other.) Also, @Mr.OMG posted...