Kasyah (Farid Kamil) is a troublemaker in high school but things change when he meets Ayu (Lisa Surihani) and she accepts him. However, Kasyah has to go to a village to complete his thesis which forces him to part with Ayu. She then meets her ex-lover Azmi (Que Haidar) who pursues her. "Lagenda Budak Setan" is adapted from the popular 1985 Ahadiat Akashah novel of the same name.