I, the weakest of the Four Heavenly Monarchs, became the master of both the Hero and the Saintess

“Kukuku ……. He is the weakest of the Four Heavenly Kings.” I was dismissed from my job, but somehow I became the master of a hero and a holy maiden.

「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