Kenichi Shirahama, a timid and bullied high school student, seeks to change his life by learning martial arts. After encountering the skilled and enigmatic Miu Furinji, he begins training at Ryōzanpaku, a dojo run by a group of eccentric and highly skilled martial arts masters. Each master specializes in a different discipline, including karate, Chinese martial arts, Muay Thai, and more. Under their rigorous and often unconventional guidance, Kenichi gradually transforms from a weak and unconfident teenager into a capable martial artist.

The narrative revolves around Kenichi’s growth as he faces various challenges, including rival martial artists, criminal organizations, and personal dilemmas. His journey is marked by intense training sessions, sparring matches, and battles against increasingly formidable opponents. The series explores themes of perseverance, discipline, and the moral responsibilities that come with strength. Kenichi’s relationships with the masters and Miu deepen as they support him through his struggles, while his rivalry with the delinquent group Ragnarok adds tension and stakes to the story.

Miu Furinji, a key character, serves as both a mentor and a source of inspiration for Kenichi. Her own mysterious past and exceptional martial arts skills are gradually revealed, intertwining with the broader narrative. The masters of Ryōzanpaku, including the stoic Apachai Hopachai, the wise Kensei Ma, and the playful Shigure Kosaka, each contribute to Kenichi’s development in unique ways, blending humor and seriousness in their teachings.

The series balances action-packed fight sequences with moments of character development and lighthearted comedy. As Kenichi progresses, he learns not only physical techniques but also the philosophical and ethical principles underlying martial arts. The story’s progression is driven by his determination to protect his friends and uphold justice, even as he confronts increasingly dangerous adversaries. Through its focus on martial arts and personal growth, the series presents a compelling narrative of self-improvement and camaraderie.