An emotional one BRS (ブラック★ロックシューター) is, it’s about the two worlds: one is about two girls in the normal world, and another in a completely different one where they fight each other with weapons. The fights in that world represents the hidden frustration and anger with their counterparts in the other (“real”) world. I don’t really understand the concept that forms the backbone of this anime. Visual-wise, it’s what I had wanted Nisemonogatari to be like initially, but you know how that turned out.
From what I understand, having something to happen with that alternate world can cause an effect with the real world too, and forget who their friends are. Some people in the real world, they could see what’s happening in the other world, but don’t exactly have control over their other selves and helplessly stay in the background.
Unlike other anime, the first episode aired 4 weeks after all the other Winter 2012 anime (early-February) and has 8 episodes instead of the average of 11 or 12. However, it already has an OVA and it does not waste it with filter episodes and actually fills it up with actual story development. I don’t see a way on how to improve on this anime than it already is.
BTW, have you noticed that there are absolutely no lines for any male characters in the entire anime, not even side characters? Also, they made episode 6 (I think) looked like the last episode with how it ended.