Isekai, where MC doesn´t need to die before "diffworld" (novel/game...) travel. MC can be summoned or can come to "diffworld" by portal. Portal can be doors, book, game engine, etc. MC probably have some purpose or he/ she´ll find one to gain something like freedom / return to previous world or evading fate of possesed character. Can have system. Story can be in virtual world.
