Black Rock Shooter: The Game may be out in Japan, but Imageepoch are still releasing promo videos for the game. The one below is for one of the game’s additional costumes:
There are other costumes available in the game as well, some of which you can find in this video. Additionally, Imageepoch also held a costume vote over at the game’s website, with costume choices such as wedding dress, Arabian and pirate.
None of those won the vote though. A costume titled “A certain heroine” (pictured to the right) did. Steins;Gate fans may recognize it. After it was selected as a winner, Imageepoch tossed BRS and Steins;Gate artist Huke’s illustration for it up onto the site.