The year is 1600, and Tokugawa Hidetada is heading west with great enthusiasm before the Great War at Sekigahara. Hidetada's army boasts an overwhelming force of nearly 40,000 soldiers, but one person... no, one monster ignores the soldiers and approaches Hidetada!! And it is also a bird monster who saves Hidetada from a desperate situation. It was…… Shotaro Ishinomori’s masterpiece period hero work “Henshin Ninja Arashi” has been reborn by action master Makoto Niwano!! Transformation Ninja Arashi Kenzan!! This is a masterpiece of a historical hero by Makoto Niwano, who himself has a deep knowledge of special effects heroes. The X (Kai) in the title refers to the "Kai'' that this work is based on the great original work, and the "Kai'' that is a fusion of a historical drama and a transforming hero. It means "solution".