Issei Hyoudou and his usual, inseparable hunger for boobs are back in action, but this time the laughter quickly gives way to a battle for pure survival. The Chaos Brigade faction breaks the deadlock completely, unleashing a large-scale attack to destabilize the fragile truce between Angels, Demons, and Fallen Angels. To make matters worse, Rias Gremory finds herself caught in the crosshairs of ancient conspiracies and dark powers that threaten to tear her from her group forever. With the threat of Loki, the god of discord, and the unlocking of devastating yet extremely dangerous transformations like the Juggernaut Drive, Issei is forced to push the power of the Dragon Booster beyond all safe limits: to save his beloved Rias and protect his dream life full of girls, our favorite dragon is ready to slaughter anyone who stands in his way.