City of the Infinite Walls, by: Tarek Imam

One day there was a city, its people decided to turn it into a house, because they wanted to become brothers despite blood feud.. so they broke the walls of their houses and made four huge walls to become the entire city, among them, their house. They all became one family, or so they thought, but with every morning they lost one of them, leaving their body outside the house, leaving a bloodstain. It was never known which of the residents of the big house was the killer, until only two remained, a man and a woman. Neither of them needed to think that they would be the other's victim, because both knew, that he was the killer.