Axel, Jonathan and Ana live together in a house that seems like a bunker in a post-catastrophic world. Outside is a threatening landscape. Once they were a perfect love triangle, with strong bonds of friendship, but today nothing is left of it. Ana is with Jonathan and Axel is alone, bit by bit tattooing his body with flies. But everything changes when Axel and Jonathan go out on an expedition in search of provisions and return to the house with a zombie that they call Pythagoras.