Demon Instructor at the Royal Academy of Magic

Setsuna is a perverted instructor who is unable to invoke magic. As a part-time lecturer at the Royal Academy of Magic, he continually tells his students to self-study. The new students who entered the academy with high expectations are disappointed in Setsuna, and judging him to be incompetent, they challenge him to a Guess duel. Setsuna plays with the special students, who are the best in a hundred years, with perverse and astonishing magic that is unthinkable in common sense! But behind the demon-like behavior, could there be a true purpose...? Source: MU