Vera is a young woman trying to cope with her life, plagued by a violent relationship, when she suddenly receives terrible news: her best friend has been murdered.
At a study meeting, Manuel tells Selene, his best friend, that he wants to try something with a girl, Catalina, his romantic interest. To do this, Selene decides to help him by showing him the rules he must follow and the possible scenarios he must face to achieve his goal.
Paula is in her room listening to music on her Walkman, until a power outage and strange sounds interrupt her.
