Notes

FF13's plot, Serah does some shit, Lightning and co go on a roadtrip to save her. They end up destroying their world and everyone migrates to the world they almost crashed their planet into, everyone lives happily ever after except two people who get stuck in crystal and can't have anyone to roadtrip them out because they hold up the old planet and getting them out would destroy the new one.

Timeskip 3 years ahead to 13-2. The ending of 13 is retconned by a previously unmentioned god and Lightning is now in Valhalla endlessly fighting some dude, everyone thinks she died. Some guy falls out of the sky into Serah's world and they then go on a time travelling roadtrip to save Lightning and end up 500 years after the end of 13 with a new world being launched because the world they're on kinda sucks. Serah dies at the end, Lightning lost her neverending battle in Valhalla and ends up trapped in crystal.

Timeskip a few hundred years and Lightning Returns. No retcon this time, but a previously unmentioned god is going to destroy the world after 13 days and Lightning can help people to delay it or something. The new world launched at the end of 13-2 is now the home of Lightning and the new god and everyone still lives on the shitty planet. They no longer age, give birth, or die of natural causes, but there's still monsters that kill them. Lightning has visions of a BDSM fairy that looks like Serah and goes on a roadtrip to save her, and all the original members of the roadtrip are off doing things by themselves.