Seijo Sensei no Mahou wa Susunderu!

Despite being the most powerful saint, Tia was accused of being a heretic and banished from the royal capital. She became the teacher for three girls who had failed as candidate saints. "Sensei, if you fly into the capital on a dragon, will you get into trouble!" "This is all sensei's fault!! What the hell was that?" "I want to be the strongest too. Please teach me, sensei?" The "combination" of their talents and Tia's saintly magic will lead to extraordinary results, ranging from the ultra-fast cultivation of crops to raising dragons to one-on-one combat. I will guide you with all my knowledge. The girls who adore their saintly teacher grow up to become the strongest saints themselves, surprising even their own country! (Source: Fantasia Bunko, translated)