I got this game with the great bundle and was interested in it but never actually played it until I played Persona 4 last month, and HAD to play this one.
My frist read adressed most aspects that I would expect to make a story like the one I hope it would, the characters and the world elements adress what is necessary to create the world an obstacles really well.
I dont know if it would be necessary but maybe a plot generator system would help structure the story a bit so it can help the improv aspec as well.
At last, the game is amazing, even if Im not that used to the diceless system it was a great game to play and to read. Got really excited to see the new stuff and hope thats still on the way.