Alina, a young beauty blogger, Zhenya, a teenage pranker, Vika, an excellent student, and Kolya, a 6-year-old True Edge fan who is always asking questions, are the Akimovs' four children. Like any kids their age, they dream of being alone at home, without the supervision of their dad and mom. But when their parents get stuck in Kamchatka because of a cloud of volcanic ash, the dream becomes a reality, and the apartment is gradually overgrown with pizza boxes and dirty dishes. How long will the joy of complete freedom last? Will children be able to cope with "adult" tasks — communicate with neighbors, defeat the flu epidemic, assemble furniture and (most importantly) return the missing Internet? And most importantly, will they miss their parents?

Students of the Sevastopol Nakhimov School dream of finding treasures that were hidden at the command of Admiral Nakhimov during the Crimean War. The treasure hunt involves smugglers, black archaeologists and even ghosts. Having gone through a series of exciting adventures, sometimes getting into mystical stories, the boys will learn the value of true friendship and mutual assistance.

Stepbrothers and teammates Zhenya and Tyoma do not like each other. Professor Maksim Muromtsev, Tyoma's father, is working on a time machine. After a visit to his laboratory, they are accidentally transported to 1999, where they meet 12-year-old Vadim Shipachev - a future star hockey player and Zhenya's idol. Now they must help Vadim to believe in himself and follow his dream before they can return to the present.

Vitya Kasatkin has an unusual hobby - he is engaged in Japanese sumo wrestling. His love for sumo was instilled in him by his father, who left the family 8 years ago and went to Japan. For many years, the boy has been living with one dream - to get to a youth tournament in Japan, in the hope that his father will see him, understand that he was wrong, and return to them.

The contents of the Wonderful Doctor’s yellow suitcase cure not only colds and the flu, but also sadness, loneliness, cowardice, and timidity. Petya is a modern, reclusive boy who refuses to go outside; he is afraid of society and other children. His parents decide to turn to the Wonderful Doctor, but his magic suitcase is stolen. From that moment on, a series of adventures begins.

Father Frost decides to send Yaga to be re-educated by Petya, a boy who has his own problems - he wants to reconcile his parents before the New Year. Petya's parents spend more time working than they do with their family, and Petya wants to fix this situation before the New Year.