In New Tokyo in 2045, the fighting world is torn apart by capital and technology. The Underground Fighting Federation (UFG) uses the "Rage" potion to distort the nature of fighting and turn matches into bloody live broadcasts. In order to find out the truth behind the mysterious death of his father, a former fighting champion, young Ling Yun entered the arena with broken old boxing gloves. Not only did he have to fight against the violent opponent who took the potion, but he also had to face the flame of revenge in his heart. With the help of a disabled mentor, a mysterious medical consultant and a young fighter who sticks to the bottom line, Ling Yun gradually understands that real fighting is never about destroying the opponent, but about using your fists to protect the light in your heart. When the final bell rang, he had to make a choice amidst the roar of the audience - whether to become a weapon of revenge or to regain the original dignity of fighting.
