13-year-old Rodrigo is a solitary teenager who finds solace in his intimate relationship with his mother, Valeria. She is his best friend, his protector, and his entire world. When her new boyfriend comes to live in their small house on the outskirts of Mexico City, however, Rodrigo finds his domain completely disrupted. He must decide if he should accept his new family dynamic or fight back, even if it means hurting the person he loves the most.