Maou-sama no Yuusha Toubatsuki  

魔王様の勇者討伐記

The Demon King, also known as Lucifer, rules over all demons and brought about 1,000 years of oppression for the human race. However, unlike his predecessors who fought against humans, Lucifer prefers to coexist with them. He is repulsed by blood and constantly hunted by assassins due to his location in a castle known to all humans. To escape this, he left the castle and lives in seclusion in the wilderness where humans cannot find him. Despite this, the humans continue to send powerful individuals, including a beautiful girl, to defeat Lucifer. How will he handle this new threat?