Set in Germany in the 1970s, this film tells the story of a 14-year-old girl who has fallen step by step from drug abuse to prostitution. Under the age of 14, Christiana (Nia Brookhorst Natja Brunckhorst) comes from a divorced family who lives with her mother and sister in an apartment in West Berlin. At that time, young people went to play in a local disco "Sound". Accompanied by friends, she also entered this psychedelic world as a minor. Here she met the teenager Detlef and his friends. At night, a group of them often roamed the streets together, and gradually she fell in love with Detlef and tried to smoke LSD with him. In order to get money for drugs, Detlef would go to a place called the "zoo" to find someone to engage in prostitution. Christiana didn't want Detlef to do this at first, but then she started injecting drugs herself and began to come to the zoo. Maiden Christiana, step by step into the abyss of psychedelic depravity. This film is based on the personal experience of teenage Christiana F.