On a quiet school day, the routine is interrupted by a disconcerting event. Lucy, a student, bursts into class minutes late, only to mysteriously disappear moments later, leaving everyone bewildered. The teacher, alarmed, sends Alba in search of her, triggering a series of supernatural events. Between flickering lights and twists and turns of events, the institute is transformed into a surreal labyrinth where the darkness hides a great mystery. In this disturbing odyssey, Alba will face the truth behind Lucy's enigmatic disappearance.