In very broad strokes:
In the very beginning the A list characters(Romances and other “main characters”- with exclusion of Manamana) get turned into blots. So you are forced to ally with B lists. Corrupted characters then set up a match with lord darkandscary(Wone with shadow powers). So while you are preparing for that, Manamana informs us that we should link up with the last b lister in the deathscapes. Memory travel happens and you are introduced to new religion, it’s irrelevant. So the b team and co go to deathscapes, the journey is mostly skipped. You link up with the last contestant, turns out he’s and admin or some shit in Versus.
Match happens you win get shadow powers(mostly irrelevant). You get introduced to another religion during memory travel(with the angel lady?), completely irrelevant.
So techno wizard lady offers to partially turn you into the mcguffin race from the first book. You do that. Admin comes up with how to de-blot the A lists. You chose who you are going to de-blot and go do that. You get a line from romance option and they become irrelevant.
Last step is to kill Vacuus and de blot Oli. Manamana is untrustworthy and dies. You fight Vacuus while the rest de-blot Oli. You win. Oli turns out to be the shiny dude(extra galactic Admin alien) you are looking for. Turns out blots(extra galactic race of space slugs) used them to open one sided wormhole to our galaxy and Vacuus was sent as a scout.
To close it NotOli needs to sacrifice themselves. Or you can absorb their power and do it yourself(this is the non-cannon ending game explicitly tells you so). So they die, you are reborn, never reunited with love intrests, and start prepearing the galaxy for incoming
reaper blot armada from extra galactic space. Game over.
Or not, it shills some comic or something at the end. Not gonna touch it.