Four unlikely girls--Mila, Robin, Vivian and Soo--led separate lives at Blackrock High until they started to experience unexplainable emotions and situations. At first, it seemed like stress-related breakdowns, but as they dug deeper, they discovered their collective experiences were actually an omen and not mental instability. A demonic presence started messing with their lives, and no one knew the reason. Still deciding to fight against it, the girls began their research with the help of a local psychiatrist. However, they never thought about the consequences. As they revealed one layer after another, they came across more evil activities in Blackrock and traces of ancient dark magic. A magic that could destroy the town--and them.

Determined to save themselves and the lives of others, the girls decided to face the demon who forced them into an impossible decision. But was that the right choice? Or were they fighting an already lost battle?