Yuu Kamishiro, a troubled outcast, faces relentless bullying at school, feeling like he doesn't belong anywhere. Desperate for acceptance, he abandons his studies and ventures into the night in search of a community that will embrace him. As Yuu navigates the streets, he discovers solace and validation in a world governed by violence and loose morals. Embracing this new reality, he trains rigorously, perfecting a single devastating boxing technique. Armed with his refined fists, Yuu emerges as the feared 'Thug Hunter,' drawing challengers eager for combat. Each brawl brings him closer to fitting into the gritty underworld he now inhabits, all the while grappling with his inner demons. With every punch thrown, Yuu edges nearer to his coveted 'holyland,' a place of profound significance in his quest for belonging and strength.