Lucifer is a fallen angel and one of the Devil King's generals. After the Devil King was transported to human world, he and Olba became allies in order to defeat the Devil King so he can return to heaven. After being defeated by the Devil King however, he moves in at the same place as Sadao and Shirō. He's good with technology and loves playing video games. To his irritation, he is usually referred to as a hikikomori even among company.