The only reason I gave it a 6, isnt because its bad by any means, its because it was over too quickly and i wanted more. But it being only 1 hr and 15 min long, everything happened so fast. There wasnt time for character development or to see relationships being built, etc.
overall, i felt like it had a good idea and potential...but i wish more than anything they would have packed this in a 26 ep season or something because i was excited to see where it went, but then it was over. I was just expecting more out of it tbh...
I did love how within the first few minutes it cut straight to the chase with the blood and gore and these big hideous creatures....oftentimes i feel like some anime take too long to get to the exciting stuff that holds your attention.