Demon Diary was published by Tokyopop in 2003-2004.

Lord Raenef is a Demon Lord, or at least he supposed to be. With his Tutor, Eclipse, he's to learn the way of being one. (causing terror, scheming to take over the world, ect.) But, with Raenef being the inoccent, naive person that he is, there is sure to be a whole lot of chaos involved. Like a female knight he takes on for a henchman, and a priest who declares to be "Chris, the Supreme Cleric Supergenius"