A Sour Beginning

Kai is bullied every day by a senior of his in school named Haruki. He keeps thinking that he is weak but one day he accidentally takes a look at a boxing gym. Kai felt in himself that boxing was a way out f his suffering and bullying. But he didn't had the money for boxing gloves so he does odd jobs for the money and eventually gets a pair of boxing glove and continues training. But one day a guy whose name Kai doesn't even know comes up to Kai and asks him to a dual battle. Kai accepts the challenge and begins his first fight. They both fight hilariously, but then kai takes a counter punch on the face and falls the unknown guy thought that Kai lost but he stands back up. This time the unknown guy decides to take Kai's life as he was in such a rage. But Kai shock him up with a counter punch to the liver which boke the mysterious guy's ribs the as another mysterious man peeks on their battle from the corner.