The time is the Warring States period. Around the time when the Demon King Oda Nobunaga was trying to unify the world. Using an iron fan as a weapon, Denki is an overwhelmingly proficient giant who rescues Princess Mio Ikko, who has escaped from Azuchi Castle, while on a journey to find the Way of the Heavens and the Living Sword. To do so. In the dark age when dark demons wriggle, the secret sword of the demon sweeps away the darkness!