So, it's a Doki Doki Literature Club AU-

But Monika isn't in control.

682 is.

You see, Rosie died years ago and 682 is using the powers he has to (horribly) cope with the loss.

And....

Yeah. 682 is Hella depressed, with a version of Rosie he KNOWS is fake but can't get rid of because he knows he'll have to deal with the loss of his sister all over again.

Yeah.