Summary
Read Mahou Shoujo Gakuen No Suketto Kyoushi manga
Ruu Brandel, a genius wizard with a talent for thousands of years. One day helped a beautiful aristocratic daughter, Franc and was to be assigned to “Magic Girls’ Gakuen” where he acts as a teacher! Now, the “non-standard” teacher life by the strongest wizard opens!
(Source: MangaUpdates)