What Anime Is This?

[xaeroevo]

hey guys, i need some help here.
i passed by my isp outlet and i saw this on their cable tv.
i want to know what anime is this from.

they looked like they were some kind of a vampire or something and they were shooting guns at each other. any help would be nice!

 

[Icecold]

Toaru Majutsu no Index.

The guy with the gun is called the Accelerator.

Can't remember which season it was though sorry.

 

[Soniko]

Chinese?!
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