TW// Demons, ghosts
So, Mario AU
Rosie's friends (the Mario crew) get possessed by demons
Particularly strong ones
Rosie had to spend FIVE YEARS with Rosalina's help to free them.
She spent those five years were spent in a time loop made by Rosalina so that Rosie would only be free if she set her friends free
So Rosie goes pretty insane by the end of it
She decides to kill all demons and ghosts
And now her friends have to save her from insanity to prevent her from killing her own family and herself.