Boyhood in Berlin. A coming-of-age story that takes place in the neighborhood around the Allee der Kosmonauten (Alley of the Cosmonauts), over a period of 10 years. A 16-year-old boy wanders through a wasteland in Berlin. He regrets a momentous act that will change his life significantly. "I really don't know how it all started..." We begin when Kalle is 10 years old. Alone at night in his ´hood. His first love. His Jugendweihe (civic initiation ceremony). Dangerous dares on the city’s district heating pipes. Friendships and weddings. Trial, conviction, jail. The world outside keeps on turning. Grandpa misses he GDR. Grandma defeats her addiction. Mother lets off fireworks on Kalle’s 18th birthday. The policewoman watches over their neighborhood. After his return from prison, Kalle begins a breathless journey back to himself. The film is a hybrid of direct cinema, graphic novel and in-depth conversations - a long-term observation documentary and an animated journey through Kalle's head. A radically honest and at the same time poetic reflection on love, family, fate and guilt - carried by the hope for a better life.