Honestly I'd pick the school one, mostly because I've never seen Fairy Tale and do not plan on watching it nor the others anytime soon (my current to watch list has 47 titles).
Actually one night I was thinking of a pokemon mystery dungeon rpg, but I thought about it more and realized many problems will arise (mostly leveling up and boss battles and how many teams there are) and I would have to think of ways to keep it all fair. If I can get some support on this I'd like to try it out, but for now I don't plan on working on it.