Akashic Records Of Bastard Magic Instructor Vol. 6

A part-time teacher at a magical academy, Glenn isn’t exactly the sort of authority figure you’d expect. He’s almost always late, and he’s prone to dozing off in class… To most, he seems like a no-good lecturer! But looks can be deceiving because Glenn is an accomplished magician with impressive techniques he’s developed on his own. When he does happen to be in the mood, Glenn is quite instrumental in helping his students learn and discover all sorts of cool magical techniques in this school life fantasy manga by Taro Hitsuji.
Glenn and the others have to devise a way to rescue Re=L in volume 6 which spans 164 pages in Japanese.
Notice: This manga is written in Japanese.