Kojiro, a young Fuma ninja, is tasked with defending Hakuo Academy against the Yasha clan of Seishikan Academy, reigniting an ancient feud fueled by rivalry and the pursuit of sacred swords. Charismatic yet fierce, he leads his clan with a blend of humor and intensity, navigating a conflict steeped in history and ambition. When the Chaos faction annihilates his village and kills their leader, his mission shifts to vengeance and safeguarding the mythical blades, especially his Fuurin Kazan—a key weapon among the ten coveted swords that spark the Sacred Sword War.

Forced into an uneasy alliance with Musashi Asuka, his former Yasha rival, he battles the Chaos Warriors, wielding a bokken capable of defying physical laws to unleash supernatural strikes. As skirmishes escalate to cosmic battles—including clashes over the Moon’s Holy Land, where the swords’ origins lie—Kojiro evolves from a school protector to a strategist confronting existential threats. His adaptability and resolve deepen amid interdimensional stakes, testing his leadership as alliances fracture and his clan nears extinction.

Though his past remains enigmatic, his loyalty to allies and dedication to thwarting the swords’ corruption anchor his actions. Through relentless warfare against ninja factions, rogue warriors, and celestial forces, he emerges as a resilient linchpin, uniting survivors while balancing the weight of legacy and survival.