In this love story, Akira must participate in a deadly game called 'Igura' in post-apocalyptical Japan in exchange for being freed from jail. His goal is to beat the strongest person in Igura. But what if he falls for him first?

In the dark world of the Igura, only one figure strikes terror into the souls of the men who risk their lives for fame and glory. His name is Shiki and death awaits those who meet his blade. Can Akira fight off the mysterious swordsman and win back his own freedom? Or will he be saved by an unlikely friend?

Akira and Rin have their doubts about Keisuke's preparedness for the Igura, doubts shared by Keisuke himself after witnessing the horrific aftermath of Takeru's insane killing spree. But when he sees massacred bodies strewn all over, will he be able to endure the brutality that is the lawless Igura? And while old mysteries have yet to be solved, new ones continue to arise. Where did the 50% pure line come from? And what of Akira's past?

Developments in the murky world of Toshima escalate as the participants of Igura obsessively seek out the addictive 50% Pure Line. What path will Akira take after witnessing the grotesque aftermath of a bloody massacre while constantly being hunted by Takeru, who is more savagely deluded and intoxicated with each encounter? And to what twisted lengths will disheartened Keisuke go in order to prove himself to Akira? As old mysteries unravel, it becomes apparent there is no hope for change, much less survival.

Akira battles a Line-addicted Takeru, who seems to be energized to an insane, superhuman level. Although Takeru seems to have the upper hand, he then licks some blood dripping down Akira's face, and then begins to suffer from convulsions - apparently an incompatibility disorder to Line!

Akira has been kidnapped and is brought to the castle where Arbitro attempts to make an impossible deal by revealing the horrible truth behind Akira's past. What will Akira make of all this - and who is lurking right outside the castle walls?