Maou Reijou no Kyouiku-gakari: Yuusha Gakuin wo Tsuihou sareta Heimin Kyoushi wa Maou no Musume-tachi no Katei Kyoushi to Naru

Frey has been fired from the academy after being set up by his colleague. He receives a job offer from a mysterious maid. The job offer is to be a tutor to the five daughters of the Demon King! At first, they didn't trust him to be taught by a human, but as he demonstrates his abilities, he begins to gain the trust of the Demon King's daughters. Frey's new life as an educator under one roof with five cute girls who are different in personality but problematic begins!

(Source: Hifumi Shobo, translated)