The true story of a high-school history teacher who decides to hide a progressive sight loss from everyone surrounding him - his colleagues, pupils, even the ones who really care about him, because of the fear of losing his job and trying to save his dignity. Due to a genetic disorder, Kacper is faced with a very real possibility of permanent blindness. Initially heartbroken, he attempts to hide his health problems from his bosses driven by his desire to keep his job and to help his students with the final exams. The only person who knows about Kacper's problem is his best friend Wiktor. Meanwhile, Kacper enters a relationship with his colleague Ewa, and tries to help a rebel student Klara, who hides a secret of her own.

A multi-layered, touching comedy about a group of friends whose relationships - in the face of life adversities - are exposed to more than one test. Filip risks his face and career for the whim of a crazy collector of Jadźka buttons. The sedate professor refuses his friend's indecent request, but he secretly kidnaps himself in a virtually reckless way. Meanwhile, a close-knit group of friends go to the mountains every year. There they discover a mystery that will change their lives forever. What will they choose? Loyalty or money? Friendship or love? Truth or lie? Own or other luck? Every choice for the heroes of the comedy "Just friendship" means trouble. Who will help them? We know: friends. Because friendship, like no other investment, always pays off.