In a near future, recorded citizens can live a comfortable life in a wealthy city, while the others are forced to survive in the slums on the outskirts. In this world, there is a new very popular form of box, the Megalobox. Equipped with Gears, exoskeletons worn on the shoulders and arms, this upgraded box allows to increase the force of the punches. In this universe, we follow Junk Dog, a Megaloboxer from the slums who, to survive, multiply fixed fights in underground and illegal rings. Tired of these matches and dreaming of real fights, he’s going to meet Yuri, the defending champion of this sport, who’s going to encourage him to take part in the global championship of Megalobox, the Megalomania. Even if he doesn’t have a valid identity to participate, Junk Dog will have to train hard to fight fearsome opponents.