I made some prototype rules for this game, and the community I made for it is linked. Basically you have an "Editor" (Game Master/Dungeon Master) who guides the writers (players/characters) through creating a world and their characters, then regularly adds a chapter prompt that they have to write a chapter for their character for. It's not a long time commitment, I was thinking to playtest a story for maybe every other day or every two days for the shortest story structure (5 chapters). It's all designed to take place in one forum post, with top-level comments for OOC, world building, character creation, and the chapters. Also, if this does just turn into a freeform r/writewithme clone, my feelings won't be hurt; it will be cool to have helped create a community no matter what it looks like in the end.