"Kukuku...... Yatsu wa Shitennou no Naka demo Saijaku" to Kaiko Sareta Ore, Naze ga Yuusha to Seijou no Shishou ni Naru

Also known as: 「ククク……。奴は四天王の中でも最弱」と解雇された俺、なぜか勇者と聖女の師匠になる, "Kukuku....... He Is the Weakest of the Four Heavenly Monarchs." I Was Dismissed From My Job, but Somehow I Became the Master of a Hero and a Holy Maiden

by Atsushi Yoshikyou, Masayuki Nobono

"Then, go ahead and die." Capsodia the Death Scorpion (Level 1) was called the "weakest" and was chased out of his position as one of the Four Heavenly Monarchs in the Demon Lord's Army. He was planning to hide out in the Human's Territory until things die down a bit, but he became idolized by Pafimia, an animal-eared Heroine, and Sharon, a pint-sized Saint... Introducing an astounding fantasy story chock full of excitement!! (Source: Kodansha, translated)