The story occurs in a world where there are two separate realms called earth realm and demon realm. A young demon named Y/n has been crowned as the new king of the demon realm. This story will be about the same demon lord who seeks for world peace and wants to unite the two realms together. How exactly will he achieve such a goal? Find out by reading this story. Note: I do not own Kamen rider. The true owner is no other than Toei.