Daemabeopsareul Wihan Gogyosaenghwal Guide

Despite her hatred of humans, the powerful wizard Oz decides to attend a human high school and make friends due to an old deal. Unfortunately, she has difficulty adjusting due to her uncontrollable magic. Things get even more complicated when a mysterious tornado from Oz's world drops a knight named Dorothy at her school. In an effort not to blow her cover, Oz quickly takes him in, oblivious to the fact that this annoying intruder may be the key to unlocking the school life she wants.

(Source: Tapas)