I found this one where this Biigoh got a sign-in cheat, where skin-skin contact allows Biigoh to gain target's one random beneficial skill/attribute/trait, and then Biigoh was tossed into the Reincarnation Space, and first world is just, you know, Kimetsu no Yaiba, because it ramps from a very low point, and then the next world is a 5 team PVP match in Naruto, during one of the world wars