Ihatefish

"Mocked and overlooked my whole life, but my agony ends here and now! I'm taking up boxing!" While extradimensional beings named “Breakers” scheme in the shadows, protagonist Mo-Han Jin, tired of being the typical chubby high school kid, decides to throw punches like a boxer. He enrolls in a boxing gym nearby, encountering various characters who will generally help him grow as a person, teaching him discipline and kindness along the way.