Tensho 16 (1588 ) in the Warring States period. A young warrior attacked Nobunaga Oda, who was about to unify the world without losing his life at Honnoji Temple. The boy's name is Ryo Sakyo. He was adopted by Akechi Mitsuhide and was Nobunaga's real child. The boy, who was supposed to be guilty of death, was called to Azuchi Castle. A new life there, encounters and anguish, and a battle against the power of darkness. The boy, who has grown up both physically and mentally, eventually heads for the fateful Honnoji Temple. A secret sword that can only be used by Sakyo. It's time to show its true value.