Assistant Teacher In A Magical Girls School

Chapter 17.3
Chapter 17.2
Chapter 18
Chapter 17.2
Chapter 18
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)