Ichi Manbai no Seijo ga Oshieru Kiyoshi Kyouiku

Saint Matina and Hero Jun set off to the Demon King's Castle to save the world from the evil Demon King Oma. However, during their journey, it’s revealed that Matina secretly harbors ten thousand times the amount of erotic energy of a normal person, and she is, in fact, a super-perverted saint.

To her surprise, she somehow ends up becoming a teacher who instructs others in the arts of perversion…!?