I believe that the Radio D course is the most basic and easier course between the various courses available in the Deutsche Welle website. Officially, the course is designed for students with little or no knowledge of German, that is, for students who are in the A1 and A2 levels. And, is focused more on basic listening.
In the course Radio D we follow the routine of Phillip, a young reporter who starts working at Radio D. He works with the reporters Paula and Ayhan. But these are not the only characters. In the course there are also others important characters: Compu, a talking computer that does researches; Eulalia, a curious and talkative owl; and, Josefine, the woman responsible for cleaning the office. In the second part of the course, Ayhan no longer participates and another character enters the scene, the new intern in the editorial room: Jan Becker.