Looking for this Manga

[throughstars]

I forgot the title of this manga. But this revolve a guy who is a very powerful magician that ended up becoming a Teacher in this prestigious school of rich and nobel magician's family. The one who recommended that guy to become a teacher was his own teacher (girl). The guy teaches the students how to cast a spell with just imagination and few words than casting tons of words.

The MC was actually an assasin or the most powerful knight of the country and ended up hiding just to be at peace. Before he became a teacher.

The other cast was a short haired big boobie girl and her long haired friend-sister. But the short haired girl was actually the daughter of the King that ask her to be hidden for her protection.

I read this a long time ago and I couldn't find it. Hope someone knew something like this. Ty

 

[Matsuura]

Seems like Rokudenashi Majutsu Koushi to Akashic Records

 

[throughstars]

@Matsuura This is it. Thank you so much. I've been looking for this for months.