Maou Reijou no Kyouikugakari: Yuusha Gakuen wo Tsuihousareta Heimin Kyoushi wa Maou no Musumetachi no Katei Kyoushi to Naru

Frey was framed by a colleague and fired from his job at the Hero Academy. He was offered a new job by a mysterious maid. The new job was to be the tutor for the Demon Lord's five daughters! At first, they didn't trust the new human teacher, but as he showed his abilities, he gained the trust of the demon daughters. His life of educating the five unique, cute, but problematic daughters of the Demon Lord begins!

(Source: Saga Forest, translated)