There's a lot of stuff that's isekai that isn't isekai, including stuff where someone is reincarnated in the past, or stuff where the person is already in a fantasy world but is reincarnated in another part of the fantasy world.

Given this looser definition of isekai, a lot of stuff is isekai.

@LukeAlmighty @LukeAlmighty Nobody gets run over by a truck, so no.