Inti Creates is no stranger to releasing side-story content for their games. For Gunvolt alone they've released two drama track CDs (with another coming soon), a side-story that was expanded upon every week for a couple months (which is also scheduled to continue), and a short epilogue in the official Gunvolt soundtrack that narrated Acura's fate following the true ending of the first game.
Suffice to say that Inti's been very generous with behind-the-scenes story information, particularly regarding Acura. And surprise surprise, they've recently published another bit of Gunvolt side-story content exclusive to the Japanese Dengeki Nintendo magazine!
