is it something from vocaloid?

Doesn't look like it to me...

Drawing style:

• stars
• crosses
• background
• a girl with a Big gun.

Just compare this picture with *black_rock_shooter* wallpapers.

Yeah but, the outfit and hair are different. Oh well, we can just wait until someone confirms it.

Xtea said:
Yeah but, the outfit and hair are different.

That's why I think she is not BRS, but she is relevant to Vocaloid.

UPD: huh, *maid_gunner*? It's obvious, lol.
Also, look here: http://konachan.com/post/show/42513

UPD2: somewhere BRS is also a separate copyright.
In this case "I think *maid_gunner* is not BRS, but is relevant to BRS."

See http://danbooru.donmai.us/post/show?md5=63bc628d1caba56cdb2f4a1340c305d7 :)

Let's sum up.
Maid Gunner is related to Black★Rock Shooter videos which related to *vocaloid*.
spoilerI have edited this post about twenty times, lol

A One-Handed WHEREISMYTANK Railgun?!

http://www.youtube.com/watch?v=tEPbgqWnHd8