The book is an epic historical novel that chronicles the life of a legendary Japanese swordsman known for his unique dual-blade fighting style and quest for enlightenment. Set in the 17th century during the early Edo period, it follows the protagonist's transformation from a wild, unruly youth into a master of the way of the sword. Through numerous duels, encounters with rival samurai, romantic adventures, and a deepening understanding of the samurai code, the protagonist seeks to perfect his skills and character. His journey is not only a physical one but also a spiritual odyssey, as he grapples with the meaning of honor, loyalty, and the true nature of the warrior's path.

The novel is a haunting tale set in a remote medieval Japanese village where the impoverished inhabitants rely on the grim practice of salvaging goods from shipwrecks to survive. The story follows a young boy who eagerly awaits the next shipwreck in the hope that it will bring enough wealth to prevent his family from starving or having to sell his sister into prostitution. As he grapples with the moral dilemma of desiring a disaster for his own gain, the narrative explores themes of fate, survival, and the blurred lines between misfortune and fortune. The stark and somber atmosphere of the novel underscores the harsh realities of life in a community caught in a cycle of desperation and the complex emotions that come with their reliance on the misfortunes of others.

This graphic novel follows the journey of a young, unruly Japanese swordsman in the 17th century, who embarks on a quest to become "invincible under the sun" after surviving a brutal battle that left most of his companions dead. Inspired by the life of a legendary historical figure, the protagonist's path is one of intense duels, personal growth, and philosophical exploration. As he travels, he encounters a diverse cast of characters, each contributing to his understanding of what it means to live and fight with purpose. The story blends visceral action with deep introspection, set against the backdrop of a beautifully rendered feudal Japan.