With most of the Armed Detective Agency captured, Atsushi and Kyouka stage a jailbreak to secure the assistance of the man with the power to erase evidence: Mushitarou Oguri. Equipped with his knowledge of the Decay of the Angel (and the assistance of a mysterious benefactor), the pair sets their sights on their next target: the majestic Sky Casino! Can they slip through the fangs of the Hunting Dogs and seize a faint glimmer of hope?