Its a mod from Last Bullet that has more to it, but this is just the main menu background. The origional mod just has a bunch of extra stuff that I didnt like. Anyways, here's the link to that.
http://modworkshop.net/mydownloads.php?action=view_down&did=12958
http://modworkshop.net/mydownloads.php?action=view_down&did=12958