In his father's absence, teenager Ippo Makunouchi works hard to help his mother run her fishing boat rental business. Ippo's timid nature, his lack of sleep, and the sea smell make him an easy target for relentless bullies who leave him bruised and beaten on a daily basis. Mamoru Takamura, an up-and-coming boxer, rescues Ippo from a violent after-school incident and takes him back to the Kamogawa Boxing Gym for recovery. Takamura and his fellow boxers, Masaru Aoki and Tatsuya Kimura, are stunned by Ippo's powerful punches—a result of strong muscles developed through years serving his physically taxing family business.