The series focuses on high school students who are currently in their last year at school. The two friends Jonas and Nico want to follow the events with their own YouTube channel - and uncover the mystery surrounding the mysterious new student Kian. He turns the girls' heads and gives the teachers a real headache as a bad boy. Krass Abschlussklasse is a spin-off of the series Krass Schule - Die jungen Lehrer, a German scripted reality soap.