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The story follows a man (only known by his ring name Junk Dog) who fights fixed matches in fight clubs located in the Restricted Area. One evening, while riding his motorcycle in the Administrative Area, he almost crashes into Yukiko Shirato, the CEO of the company Shirato Group. Junk Dog picks a fight with her bodyguard Yūri who is also the Megaloboxing Champion. Yukiko stops the fight but Yūri seeks out Junk Dog and meets him in a fight club where he easily beats the less-experienced fighter and tells him to fight him again in the Megaloboxing tournament Megalonia, which Junk Dog would need a place at the top of the official Megalobox rankings to qualify for, as well as a proper citizenship ID to enter the rankings in the first place. After Junk Dog's coach Gansaku Nanbu persuades the mob boss Fujimaki to forge Junk Dog an ID under the name Joe, the two are given 3 months to achieve their goal of working their way to the top of the Megalobox rankings in order to have a chance of fighting in Megalonia.