Juan is a 50-year-old man. He has stuttering problems, suffers from visual impairment, has an abusive boss at work, has never had a girlfriend or partner, and has no friends. His life is monotonous and lonely, at work and at home. Everything gets worse when his mother, who was his only company, dies. One night, Juan discovers a man dressed in black in his room, who proposes a pact in exchange for recovering his sight and speech. From that moment on, reality and fantasy will no longer have clear limits.