definitely this one ! https://www.mangago.me/read-manga/youkai_gakkou_no_sensei_hajimemashita/
but you can also read other mangas such as these whenever you're in the mood
https://www.mangago.me/read-manga/magical_girl_and_narco_wars/
https://www.mangago.me/read-manga/mashle_magic_and_muscles/ (I know it has an anime but rearing is is always good)
https://www.mangago.me/read-manga/ultimate_exorcist_kiyoshi/
https://www.mangago.me/read-manga/phantom_busters/
https://www.mangago.me/read-manga/kagurabachi/
https://www.mangago.me/read-manga/meshinuma/
https://www.mangago.me/read-manga/tokyo_aliens/
https://www.mangago.me/read-manga/madan_no_ichi/
READING*
KAGURABACHI MENTIONED
Any similar mangas like Mairimashita, Iruma-kun? It's so good! I want to read other mangas like it while I wait for the update.