Main character, a reincarnated human with cheat abilities who becomes a demon. He guards the middle floor of the Demon Lord's castle but is a shut-in with chuunibyou tendencies. After falling in love at first sight with Cecilia, he lets the Hero Party pass and confesses, only to be rejected. He breaks his demon horns and wings to disguise as human, joins the Adventurer Guild under the name Youki, and works hard to raise his rank and win Cecilia’s heart. He has a loyal group of former subordinates: Duke, Happiness, and Seek.
