The documentary First of May explores the more than a century-long evolution of the celebration and the meaning of this day. The structure is composed of memories, newspaper excerpts, testimonies found in archives, etc. - all these passages are brought to life by the actors' voices, taking on the roles of journalists, factory workers, policemen, workers and ordinary people who watch May Day, sometimes with interest and verve, sometimes with distance or irony.

Mária, a retired teacher, one fine day decides she no longer wants to feel like a cow, and when not even the mayor helps her against the arrogant source of local evil, she obtains a gun and resolves to do what most of us occasionally think of but immediately banish from our minds. Very soon, however, she discovers that just as murder is morally complex, it is equally complex logistically, despite her former pupil, now on probation, offering her this priceless life advice: “Crime only looks simple, Mrs. Teacher, but then something always goes to shit.”

The star Svituška, paired with the admired Sirius, is one day cast down to earth by the jealous star Proxima. Svituška falls into a village where she is found and cared for by a teacher named Václav. Svituška has only a few days to return to the sky or she will perish. She relies on Sirius to rescue her, but intrigues by Proxima keep him away. Each evening, Václav watches the princess skating on the frozen lake and harbors a secret love for her. One night, Svituška accompanies him and, upon seeing the princess, rekindles her own light, fueled by the power of Václav’s pure love for the princess. With Václav’s help, Svituška will survive until she can return to the heavens.