Following a devastating third world conflict that reshaped Japan into Toshima under Vischio's rule, the city's shadowy corners host lethal battle games called Igura. Participants engage in blood-soaked duels for the opportunity to challenge the tournament's king, Il-re. In contrast, Bl@ster, another competition, prohibits killing and weapon use, relying solely on knockouts. Akira, a solitary young man excelling in Bl@ster, faces a dire twist when framed for murder with no means to clear his name. Just as despair looms, a mysterious figure named Emma emerges, offering a glimmer of hope. In a bid for freedom, Akira must brave Igura's ruthless trials and vanquish the formidable Il-re.