when i started watching it,i checked out how many episodes it has 1st,then when i found out it was only 11 i detto to myself to keep watching it to the end! the 1st episode was kinda...weird and with Kagari being Loco-in-the-Coco i figured that da that i should've bailed but it somehow make me want to continue,maybe because of what i detto o because of Black ★ Rock Shooter!! and the Epic fight scenes!! *whispers* o because i have a few similarities with her...(not Mato) and i did watch it til the end....and...it..was...AWESOME!!!! XD
It's good but I would recommend watching the OVA first. I personally prefer it but the Anime series has a nice cast of characters and the action/other world is really spectacular in animazione as well as the psychological aspect of it.