March 18th, 2061 – “Operation Downfall” Commences:
With its reliance on BAC, humanity had forgotten how to operate even basic transportation, let alone weapons.

After the attacks from BAC and the subsequent social chaos, the human population was reduced by half.

However, there was a group within Lerman Matsunaga that foresaw the dangers of a dependence on Buster Engines and the BAC that controlled them.. This group led the third stage of energy development, an anti-BAC weapon developed in secret that would render Busterium inert, called the Rolling Gun.

The third stage of energy development, the military package of the Rolling Gun and the mothership named the Anti-BAC Suppression Independent Control Armament “Rolling Gun” Deployment Warship RF-42R STORK was rolled out.

The mission: to destroy BAC, which has turned Lerman Matsunaga into a fortress.

“Rolling Gunner” is a 2D shooting game:
The player must skillfully dodge the barrage of bullets flying from all directions, and advance through the stages while controlling the rolling gun that circles around his ship. Online ranking is also available for players to compete their skills.

“Rolling Gunner” is a side-scrolling shooter:
For those who want to enjoy the game more, there is an additional DLC “Over Power”. “Over Power” is an exhilarating shumps that can be enjoyed with twin sticks.