Sounds like a ton of fun, not sure I can commit the regular time needed though, but I'll definitely consider it.
Has there been a Claymore flavored mafia game? Sounds like the perfect setting almost (GM= mayor at first, overseeing lynching, then at some pre determined turn a Claymore, while a group of Yoma looking like players, devouring a player each night, is rampaging. Humans have to designate who they think is a Yoma each day cycle to the Claymore, at everyone's knowledge, the Claymore revealing right before a night cycle if the designated was human or not (if human they would not kill him though.)
I suppose that because of that last element games would tend to be shorter.