Kang Eun-kyung, who has come for her teaching practicum, encounters members of the Black Sky black magic club, who are ranked first in the national mock exams. She discovers that there is a witch behind the girls. To retrieve the souls that the witch has taken, she opens the door to the world of darkness.

모교로 교생실습을 온 의욕 충만한 예비 선생님이 전국 모의고사 1등을 달리고 있는 동아리 소녀들의 비밀을 밝혀내기 위한 고군분투를 다룬 코미디