30-year-old Alex discovers that his girlfriend Carolin has an affair with their neighbour, photographer Jens, and is forced to move out of their shared flat. He moves in with his friend, animal welfare activist Nele who has a long-distance-relationship with her French boyfriend Etienne who lives in China. Alex tries to find out why his relationship with Carolin failed and what actually constitutes a man. Meanwhile he and Nele who were in love with each other since primary school fall in love again.