The Demon King's Educator -The common teacher who has been exiled from the Brave Academy becomes a private teacher for the Devil's daughters- is a Manga/Manhwa/Manhua in english language, ACTION series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

Flay 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 girls begins!