Three colleagues and devoted friends – Danton, Petar and Andrey – share an office, and not only, on the fifth floor of a socialist industrial research institute from the mid-eighties. Every morning when they come to work they lock the door of the office and, armed with binoculars and great interest, they begin watching the aerobics exercises of a young girl in the nearby building. Suddenly, their tranquil daily round is disturbed - a new director takes over the Institute and decides to develop close scientific partnerships with similar institutes in Japan.

1197. King Kaloyan ascends the throne in hard times for Bulgaria. The country is still recovering from a century of Byzantine subjugation. He is forced to carry out a very flexible foreign policy in order to strength his positions. Pope Innocent III recognizes him as Emperor (Tsar), but a little later the fourth Crusade crosses the country under Emperor Baldwin. A new conflict is coming. Tsar Kaloyan wages the decisive battle at Adrianople and wins.

Three novels deal with the mentality of the children, their agitations, and the merry and sad things in their everyday life. The movie is created with a lot of humor, cheerfulness, and great love for the kids.