The story is in the original null if im not wrong(sb correct me if im), if you pay the FULL you get the entire story with nsfw contents(what fouzi said, i have not downloaded yet but i think they tweaked the story a bit so is not the same as the og Null, that was Sfw).
with the DELUXE version you get more Nsfw contents that are not in the FULL version, plus extra story and lore.