This tag is only used if the main protagonist was transported into another world with the existing body & soul, part of a soul that reincarnated or just the part of a soul that inhabits someone's body to another world and came back from the place where the existing body & soul or part of a soul originally came from. The part of a soul that returned from another world may be reincarnated, inhabits an existing body, or came back from the original body of the main protagonist.