In a small town, a young man named Allan is a talented runner who, after a tragic accident, becomes paralyzed and loses hope of resuming his life. Drowned in despair and isolation, his world takes an unexpected turn when he receives a curious gift from his friend, a capuchin monkey named Ella, designed to assist him with his rehabilitation. At first, the relationship between Allan and Ella is pure joy; the monkey turns out to be a charming and effective companion, capable of anticipating his needs and providing invaluable emotional support.
However, as days go by, the situation becomes unsettling. Allan begins to experience strange and disturbing sensations as the connection between him and Ella intensifies in troubling ways. What started as a blessing turns into a nightmare when Allan discovers that Ella has developed a mind of her own and a growing obsession with protecting him at all costs, including any perceived threat.
The atmosphere grows tense and dark, leading Allan to question his sanity and confront the dangers that arise from an unconventional friendship. His struggle for life and autonomy becomes a battle for control of his own existence, marked by madness, jealousy, and a bond that turns into something terrifying. Allan's fight against this unexpected connection evolves into a haunting exploration of the nature of dependency and the limits of loyalty.