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

After being fired from the Hero Academy, Frey was offered a new job by a mysterious maid. The job was to be the tutor for the Demon Lord's five daughters!
(Source: Comic Polca, translated)