Gregorio is just another person in the city. He lives alone in a small apartment with no sunlight. He works in a factory and goes back home in the evenings to have dinner in front of the TV. One day, upon coming home from work, he discovers that a little cockroach has been stealing food from his kitchen. Instead of killing it, Gregorio takes pity on it and adopts it as a housemaid. The cockroach grows under strict discipline as Gregorio gradually sees the life he knew change completely.