Dreams and ambition are distant concepts for Kaneishi Gou, a young deliveryman drifting through a listless life as a part‑time courier. His mundane routine shatters when a package brings him to the run‑down boxing gym known as BOX Toramaru. The gym’s owner and sole trainer, the bald‑headed Toramaru, is in a panic: his last remaining fighter has fled just days before a professional bout, and the promoter will cancel the event if no replacement is found. Desperate, Toramaru lies to Gou, insisting that boxing is easy and promising a handsome payout win or lose. Gou, craving quick money, agrees to four days of slapdash training and steps into the ring as a complete amateur. To everyone’s shock, his raw fighting instinct and unyielding stubbornness carry him to a knockout victory. That first taste of the sport awakens something in Gou. He joins BOX Toramaru and throws himself into training, his natural athleticism and relentless drive allowing him to absorb technique at a startling pace. Within months he blows away a highly touted prospect, Mizuki Shou, in the professional licensing exam, earning the nickname “The Blond Destroyer.” Yet Gou’s ascent is shadowed by an even greater presence. Hayasaka Ren, the reigning Japan featherweight champion, is a quiet, almost monk‑like figure who wears a cassock and is said to have been blessed by God with a left fist of devastating power. Ren is the adopted son of the protagonist from the original 1988 series Kami‑sama wa Southpaw, and he is hunting for a worthy challenger. When Gou and Ren finally cross paths, the difference in levels is staggering. Gou is humbled but not crushed; he resolves to climb the ranks and earn the right to face Ren. The narrative follows Gou through the East Japan Rookie King tournament, where he meets a colourful roster of opponents: the fortress‑like infighter Renga Kigami, the graceful southpaw rapper Beat King, and the tall, handsome university student Akira Nakagami (who also has a romantic rivalry with Gou over his childhood friend Takamizawa Ran). Each fight forces Gou to adapt and refine his crude brawling style into something more polished. Ran, a brilliant but clumsy heiress studying at Teito University, provides emotional support and a link to Gou’s past; she once saved him from despair and now shadows him in Tokyo. The series builds toward the inevitable collision between Gou and Ren, but ends after only three volumes, leaving the full arc of Gou’s challenge and his transformation from raw diamond to polished champion incomplete. The manga is a sequel that picks up the themes of the original—a left‑handed boxer blessed with divine talent—while focusing on a new protagonist’s accidental entry into the sport and his rapid, gritty development amid a field of distinctive rivals.