"Baki-Dou" is a continuation of the long-running "Baki" series, created by Keisuke Itagaki. The narrative picks up after the events of "Baki: Son of Ogre," focusing on the martial artist Baki Hanma as he continues to seek out powerful opponents to test his strength. The story is set in a world where underground martial arts tournaments and brutal one-on-one battles are commonplace, with fighters pushing the limits of human capability.

The central plot revolves around the emergence of a new challenger, Miyamoto Musashi, a legendary samurai resurrected through a scientific experiment. Musashi's arrival disrupts the balance of power in the martial arts world, as his unparalleled swordsmanship and ruthless combat philosophy pose a significant threat to even the strongest fighters. Baki, along with other top-tier martial artists, must confront this ancient warrior, leading to a series of intense and high-stakes battles.

Key characters include Baki Hanma, the protagonist, whose relentless pursuit of strength drives much of the narrative. His father, Yujiro Hanma, known as the "Ogre," remains a looming presence, representing the pinnacle of martial prowess. Other notable fighters, such as Doppo Orochi, Kaoru Hanayama, and Retsu Kaioh, also play significant roles, each bringing their unique fighting styles and philosophies to the conflicts.

The series delves into themes of martial arts mastery, the clash of modern and ancient combat techniques, and the philosophical differences between fighters. The battles are characterized by their visceral intensity and strategic depth, often exploring the psychological and physical toll of combat. "Baki-Dou" maintains the series' tradition of over-the-top action and exaggerated physical feats, appealing to fans of martial arts and combat-focused storytelling.