Fripside are a well known pop duo to anime OST fans, especially with their track, “only my railgun”, being used as the OP for hit anime, A Certain Scientific Railgun. News has recently broken that the duo will also be providing the OP for new light novel anime, Black Bullet.
The new track doesn’t have a name as yet but the anime looks set to launch on Japanese TV sometime in April 2014.
PV for Black Bullet
Doesn’t show a whole lot but what it does show looks pretty good.