I did a couple of these on the Tumblr, but what the hell it probably belongs here now.
It’s a highly anticipated anime about a pair of kids with an awkward, on-again-off-again friendship.
There is pain in their past. One has familial troubles.
Their lives are not lived entirely in the realm of the living; the unreal world of fantasy helps them cope with their troubles.
A girl has a single glowing eye.
In her fantasy world, she fights the inner demons that hurt her, and the real people who represent them — including someone she loves deeply — using improbably large weaponry that causes unimaginable damage.
Chuunibyou Demo Koi ga Shitai? or Black Rock Shooter?

My answer is Black Rock Eyepatch shooting girl! IT ROCKS!
Oh damn. This makes me want to watch Chuunibyou even more now.
You should. Though the fight scene was sort of an elaborate joke, it was the kind of thing people have been wishing Kyoto Animation would do for a long time. Overall it’s a fun series.