Hozuki's Coolheadedness (Japanese: 鬼灯の冷徹, Hōzuki no Reitetsu) is a Japanese manga series written and illustrated by Natsumi Eguchi. The story revolves around Hozuki, a demon who works for the King and Head Judge of Hell(Japanese:閻魔大王). There are many interesting characters and pretty demons. The manga was adapted into a television anime series. You can watch the series on Netflix now:)