Story concepts #2
Because none of the fanfics written in the Naruto universe include anything more than a convenient god who needs the MC to save the Naruto plot, here's a backstory idea for why the rebirth and transportation of the MC's soul work!
What if chakra acts like water? What if earth and Naruto were universes born next to each other (see story concept #1)? What if, because of the inequality of magic/chakra between the two worlds, N's universe circles E in an oblong orbit, and every time N gets too close to E, chakra flows from N to E. This happens because chakra acts like water, as in, it will want to fill the non-magical vacuum that is E. However, this is an exchange, as some other form of spiritual energy will have to fill the void where N's chakra has been sucked out. Therefore, Earth gets a mysterious burst of magic every hundred or so years, and the Naruto universe gets a universe traveler.
TL;DR: Earth steals chakra from its sister universe Naruto, so Naruto steals one of Earth's souls in return.















