Nerea, an obsessive girl, dreamed of a romantic vacation in some idyllic cabins. However, her dream turns into a nightmare when she discovers that her boyfriend Diego is unfaithful to her. During a heated argument between the two, Diego trips and dies. Nerea, desperate, tries to get rid of the body in the only way she knows to solve things: by searching for tutorials on the internet.

When Koldo discovers that La Piedra de Mor could be on Mount Amboto, he sends his henchmen into the forest to recover the jewel. The gangsters kidnap Aníbal and Barakaldo, two peculiar cabin workers, who found the stone in the forest. What Koldo doesn't know is that these two friends just drank a magical concoction that could ruin the day for him and his henchmen.

Luna, the cabin manager's assistant, leaves Aníbal and Barakaldo in charge of three tenants who are staying for the weekend to celebrate Christmas together. Despite the clumsy duo's desperate attempts to make everything go well, things get out of control when the three friends read a spell book that summons very aggressive and very short monsters.