en Cuevana 3. At a motivational seminar, seminar leader Marius meets Jörg, an Ossi who doesn't understand. When Marius teaches him how to open a door with the right attitude, suddenly none of the participants can remember them. They are forgotten by the world, dependent on each other. Marius discovers that opening doors in the parallel universe creates unexpected opportunities for them to change places at will and live freely. But life as a couple brings with it tensions.