Stevie, Chris, Peter, Klaus-Maria und Dieter have just graduated from school. It's Father's Day and the five friends promise to reunite every year on that same day. Yet with their lives going into different directions, they lose sight of each other and never fulfill their promise. Only Dieter's unexpected death brings them back together after twenty years. Suddenly, everything is like back in their school days – especially when they encounter their old nemesis Andi who hasn't changed a bit. Although the foursome stumbles from one catastrophe to the next, the friends won't split up again until they have fulfilled Dieter's last wish.