Sasuke, a ninja of the Fūma clan, stumbles upon an infant, Fujimaru, kidnapped by a giant eagle. Rescuing the child, he raises him as both mentor and surrogate father within the clan. When clan politics later brand Fujimaru a threat, Sasuke is commanded to execute him. Torn between duty and paternal bonds, he defies orders.

In a carefully orchestrated duel, Sasuke stages his own defeat, feigning death to shield Fujimaru. With his last breath, he imparts a final, crucial truth: the boy’s mother still lives, secretly seeking her lost son. This revelation drives Fujimaru’s future path.

Sasuke’s fate remains uncertain, his absence marked when Fujimaru revisits the battle site. His choices weave a legacy of duty, paternal love, and moral turmoil, igniting Fujimaru’s quest for identity and connection to his fractured past.