Four Little Nightmares

Mono is doomed to a time loop after being betrayed by Six, and everyone thought that was where his story ends. But after encountering his younger self, Mono realizes that he's not quite ready to give up and is determined to find the Six that betrayed him from his timeline. Intent on revenge, he travels the Maw where he meets another boy named Seven, who was eaten by Six. Both are ready to confront the one who hurt them, but what if that ends up being harder than they expected? And not only that, but what if the Raincoat Girl survived the fall back at the Nest, and what if she and Six found each other again?

A story based on revenge ends up being an adventure full of hard decisions, new friends, and uncaging the truth about what happened to their world. Mono never thought he'd work together with Six again, but will a new threat, the "Happy Man", change his mind and force the four characters to team up? Or will grudges and past traumas turn their lives into a nightmare?

Characters are all 19 except for Six who is 18. In the world they live in, people live for a very long time, up to 120 years and such, so 18-19 is still considered a "kid" for them. They are mature like normal people of that age, but they also have some childish tendencies and can still act kiddy. You'll see that with lots of the dialogue.

Also uploaded on AO3 under the name AverageArchiver1.