Au fait j'ai trouvé ce commentaire sur une vidéo d'un trailer d'Agito/Agito+ :
"Ricky Tse il y a 1 mois (modifié)
I saw people compare this to Type-0 and think this is not an original or just a spin-off storyline. I think those people did not really know about the world settings behind Type-0. As far as I know. Its follow the concept of Saṃsāra.
The world recreate itself after all people died in the final battle (end of world). And the characters have to live their life again and again, facing the almost same storyline and same outcome.
However, after 600000000 times of Saṃsāra. The God of the world (fal'Ciel) finally choose someone as AGITO. Making it a happy ending. And that happy ending ends the recycle system of the world. That's Type-0 storyline.
So, Type-0's storyline is not the first story, but the last one under the 1st gen God "The Mother (Mwynn/Muin)" whom mentioned by ACE. And under the same world of Fabula Nova Crystallis system (but didn't know if it is in the unseen realm or not). FFXIII is considered a world under control of the 3rd gen fal'Ciel Etro. Which also sharing some settings of the Type-0 world."
Flemme de traduire mais bref, je pense qu'on peut prendre ça en considération