Disillusioned with his faith and seeking to prevent the impending apocalypse, a devout priest believes he has decoded a secret message indicating the birth of the Antichrist will occur on December 25th in Madrid. Driven by a desperate sense of duty, he plunges into sin, committing theft and vandalism, hoping to sell his soul to the devil to gain an audience with the Beast and thwart the end of days. With his moral compass skewed, his uncharacteristic actions land him in trouble with the law but guide him toward likeminded individuals ready to partake in his unholy quest.

The priest allies with an underground heavy metal enthusiast who claims to have knowledge of the occult and a famous TV psychic with a reputation for speaking with the dead. Together, this eccentric trio embarks on a darkly comedic journey filled with bizarre rituals and outlandish attempts to uncover the truth behind the birth of the Antichrist. As Madrid's streets pulse with yuletide celebrations and oblivious revelry, the group delves deeper into a supernatural conspiracy, racing against time to intercept the prophesied harbinger of doom amidst the chaos of the holiday season.