In the aftermath of a devastating war, the legendary Ninku warriors, who nearly decimated the Imperial Army, find themselves shattered and defeated. Branded as villains through clever manipulation of propaganda, the Imperial Army rises as the supposed protectors of the people. Among them is Fusuke, a seemingly innocent child but once the esteemed leader of the first Ninku division, on a quest to reunite with his captured mother. Along his path, he crosses paths with Aicho and Touji, former Ninku captains, as they unite against the imperial forces hunting down the last remnants of the Ninku. The Ninku, a secretive clan of extinct ninjas possessing formidable and mystical skills, are coveted by various factions seeking domination. Most coveted is Fusuke, an unassuming yet immensely powerful Ninku member targeted for his exceptional abilities. Teaming up with diverse Ninku specialists, Fusuke confronts the adversaries responsible for the downfall of their revered clan.