The point of Maho Diablo is not about the common high school RP. It's a random senseless one that is for humor. Japan was picked for that one simply because it's something that would make you think more outside the box than just your average Mississippi middle school or whatever.
While on that note, Ryuketsu is not in Japan. It has it's own map. You only think of it as Japan because you don't know what medieval is or refuse to accept that we were in that period at some point.
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Back to the most recent suggestion I made. That's actually the most likely I will make next. I did give thought to bringing Head Hunters back, though I still don't know what happened to Pink. She lost her internet or is moving or something, who knows. Anyway.
This RP basic concept is similar to Darker Than Black. Where people will have a specific power and after they use the power, they must fulfill a certain obligation as a result that most likely is an inconvenience in someway. For example, you have the power to fly. After you use your power for a fair amount of time, you will need to fulfill your power's obligation and smoke a cigarette. It won't be like that for everyone. Everyone's obligation is different. You could be obligated to cut yourself, kill someone, do some weird dance, anything really. Most of the time, it won't be a good thing though.
If your character does NOT fulfill their power's obligation when they should, they will die in a specified time.
I don't have much of a storyline for this yet.