King of Four Thrones

For the last 17 years, Takeo Mugetsu lived his life like anyone else. Though his existence is not like any other. The first Emperor of Two Heavens and the King of Four Thrones. Now, he decides to join a peerage of devils. OC replacing Issei and Vali. Blood, Violence, Gore, Language, Cross-over elements, Harem, Lemons.