Japan's fate was sealed after Urotasu, known as the most powerful Kanjo-Gun, died in his ultimate battle against Anukus, the legendary immortal Kanjomon. Just when he thought it was all over, Urotasu suddenly woke up in the body of a teenager named Duncan Thorington, who bore a physical resemblance to him, starting with the same silver hair and blue eyeball colour.

In addition, the world Duncan was in was much different than Urotasu's previous world. In her body and identity as Duncan, Urotasu also lived her new life as a young witch of the Thorington family-one of the ruling families of the Kingdom of Rosstania, who also led Rosechester City. And Urotasu's goal is only one, to avenge Duncan's death at the hands of his own father, Danzel Thorington, The Rampage Thunder.