Interesting multiverse AOT
I never knew before that these exist
Apparently there are official Kodansha's books released back then that tell story about alternative endings
These are Attack on Titan Choose Your Path Adventure or AOT Adventure: Part 1 and Part 2
You can read more about these on AOT Wiki site
Kodansha's word on the official page of the second part of the series: There is no single right answer in the world of Attack on Titan. What will you choose? Make a choice you won't regret this time either!
This fits very much with Everett interpretation (many-worlds interpretation) but in AOT, bro these are straight up alternate timelines
Even though these were probably not supervised by Isayama himself, assuming from 0 mention on interviews, these are still interesting to the alternate pathways plot scheme, which is what the future-revealed true ending will be about (hope!)
Who knows, maybe the AOT 3 game will base on these (this is the entire reason I use Theory flair, I didn't play the first 2 games so idk if there are similarities between the games and these books though, let's just see)