Omori Crossover AU except it's actually Angst [Various Spoilers]
All the characters don't appear at once, only when it's most thematically or dramatically appropriate.
Canon Sunny meets (O)Mari and both think they're hallucinating.
Endless Sunny and Omori meet up with other Sunnys and they start to panic about whether their own Omori was real or not. TMAWH Sunny knows for a fact his is not, but now everyone else is not so sure.
Characters from Fluff writing where no one dies just spontaneously see one of their friends be utterly depressed or out of character, only to find out this one apparently killed somebody. (Fluff Aubrey working a Cafe shift sees depressed Mari order twelve expressos and smile her way through the day).
Eye for an Eye Basil meets YBM Basil and they have a much needed heart to heart.
Sunny's mom and Hero are horrified to hear about YBM Hero.
It's the climax of Pursuit AU, and Hero is running away, but runs into one of the Maris. She is horrified by him.
The Pursuit characters having a REAL hard time trusting any of the Heros.
The Bad Endings exist as well, and multiple unfortunate sightings happen.
The Eline YT video gang is also here.
A bunch of the Good Ending characters get together like a council and decide what to do for the Bad Ending characters. Should they get directly involved? Guide them gently? Help them heal? Straight up tell the truth as they think they know it (some patterns are obvious, some are not)?
Then the Emori gang shows up as Comfort/ Comedy Relief, because they are somehow the healthiest group as a whole, but different enough that any trauma associated with that specific character is muted.
Also, there are now at least 6 Graves where before there was only Mari's.
