Maybe I'm just getting old, because I really liked this show, yet couldn't put it in the category of favourites like Elfen Lied or Claymore.
It revolves around Rentaro, a civil service officer in the Tokyo area of the near future. For the past 10 years Gastrea, man-eating monsters, have been constantly attacking humanity and are being just held at bay by huge monolith fortifications around the city made of Varanium, the only material that is impervious to their attacks. Rentaro is aided by Enju, one of the Cursed Children. These are all female girls with red eyes and extraordinary abilities, brought about by having part Gastrea in their blood. Eventually, the Gastrea find a way around or through the monoliths and someone needs to save Tokyo...
This show has great animation and characters with plenty of bloody violence, which I dig. Yet, I felt something was lacking, because I couldn't put it up there with my old favourites. Maybe I'm just getting too old for this stuff haha. Anyway, for you younger guys, check this out, it's fun!