When a fracking environmental accident rips apart the earth's crust, the resulting hole lets out prehistoric sharks from underground. The sharks target a group of women and trap them in a cabin.
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
