OK, I'm a little late to the party, but I finally had a chance to see this. The OP a bit annoying, and yet creepy, so it did it's job of setting the mood, and what a mood this episode has. Very quiet, not very lively at all, and yet it has your complete attention, as if you feel that you'll miss something important.
Also, I agree with what someone said a couple pages back. It seems as if a curse has fallen over the school and the surrounding area. Multiple health issues among the students. Run down campus, etc.
The level of detail is quite nice. I also thought the scene where Saka...er...I mean Kouichi passes Mei in the car was executed nicely.
Endless "Morgue---->" Soul