Having watched the first episode, I'm on the fence for this one; I want to like it, since the first season of Higurashi was a positive surprise (nevermind that the second season was criminal in comparison), and the contemporary scene needs strong series after some dire months, but this is so far a disappointment. The OP managed to get me in the mood, but the rest... I couldn't quite shake the feeling that I was watching some bizarre Japanese take on And Then There Were None (the epitaph didn't help...), a premise right out of Faust and a loli that managed to set my teeth on edge (and here I thought uguu~and gao were annoying... I'm still inexperienced :'( ). The protagonist is somewhat nondescript as well, but that's not unusual for series of this type, and they could've spent more than three seconds on his name... I trust that this will run for 2x episodes, as the vast menagerie will need some fleshing out, so perhaps things will get better.
Still, I can't quite shake the unease that the first episode managed to stir up; while I'm reasonably certain that this can't be too cliché, the elements are all there. An aging patriarch about to receive judgment for making a bargain with the "devil" (witch), his scions about to pay the price for it, an unstable loli just waiting to snap/turn schizofrenic/be possessed by said witch and go on a rampage, etc. If the loli starts to display a completely different personality Rika-style, I might just scream.