Kekkai Sensen was pretty cool. I love the use of blood weapons. I know people will associate it with Deadman Wonderland, but I can't help being reminded of the Kate Daniels series.
I hope they explore what it's like being cut off from the world. Like where do their resources such as food and water come from or how their environment is effected with magic intermixed.
Also I kept getting a Cowboy Bebop vibe.