In a decaying world where walls pulse like flesh and morality has long since rotted away, two siblings—Rafa and Isa—descend into a cavernous nightmare guided by a charismatic, unholy figure known only as The Mouth. As boundaries blur between pleasure and pain, god and grotesque, their bodies become vessels for something far older and darker than sin itself. As the cave transforms into a cathedral of carnal rebirth, they must face the truth: salvation may not come from purity… but from surrendering completely to the flesh.