Ep 1: Hmm... Pretty good. Good mystery, and for some reason the character interaction reminded me of Denpa Onna. An "ordinary" teenage guy thrown into a world of weirdoes, it's kinda similar in principle, isn't it? Well, the character interaction is nowhere near as good as in Denpa Onna, but still, there's a little bit of the same charm. Also, there's some real depth of themes here. Hopefully also of characters in the future. Well, considering what I know from reading the first chapter of the manga a while back (the manga starts a little bit to the future from here), I believe the male lead at least will gain some depth.
Also, the ED is kinda good.
Edit ep 2: This is the case where the manga starts, but there's... a difference. Anyway, the mystery is intriguing again and the characters are still average. The Fourth is probably my favourite character ATM, he's got a firm grip of reality and I like his personality. I really like Meo's design, BTW, she's really cute.
Meh, they changed the ED... :(