This takes place after Monika deletes herself and you get the true ending. Basically, Sayori says goodbye to the protaganist, he disappears foever (or maybe not forever) and Sayori becomes president of the literature club, yuri becomes the vice president, Natsuki becomes secretary.They have their own adventures and start to have fun.

Canon characters:
Yuri (open)
Natsuki (open)
Sayori (open)

Maybe? characters:

Original characters: (up to five, and they must be in the literature club. if they aren't you could just make it an au where they are in the literature club)
Kiboshi: Me!
Aisurrí: RoseSnow