A supernatural radio broadcaster named Arvino, who always airs at 10 PM, recounts the sins committed by one of the victims, Melinda. Viska, a hospital nurse on night duty, notices something strange about Melinda, and soon, the strangeness begins to affect Viska. She starts hearing the radio broadcast incessantly buzzing in her head, indicating that the demon Asmodeus is targeting her.

Viska has a childhood friend named Martha, whom she envies for her intelligence. Rini, one of the dorm mates, constantly whispers hatred against Martha. Eventually, Viska is incited to hate Martha. Chandra, Viska’s twin brother, along with Father Ignasius, warns that there is a looming danger targeting Viska.

During the trip to Jakarta, Chandra experiences strange occurrences. With his indigo abilities, he investigates a murder mystery. Viska locks herself in the dorm room to avoid harming her friends. However, Arvino threatens to target the life of her close friend named Ika.

Ika dies, and Viska is haunted by her death. On the day of her funeral, Viska sees a green apple that evokes childhood memories, and recalls their past together with Arvino. Chandra comes to pick up Viska and tries to take her back to Semarang, but Viska refuses and chooses to stay silent in the chapel at 10 PM.

Flashback to six years ago, when Viska had just graduated and started working at the hospital, she met a mysterious patient named Stella. The long-held grudge solidifies Arvino’s resolve to claim Viska’s soul. Chandra urges Viska to return to Semarang as soon as possible to protect her from the demon targeting her.

Viska is deeply saddened by Chandra’s death, leading her to experience severe hallucinations. All her deceased friends approach her, nearly killing her. Father Ignasius shares the history of Viska’s parents and how to defeat the demon, leading Viska to finally lure the demon Lucifer out.