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The new school year is beginning. Maria Pavlovna is returning to school, the headmaster and Natalya are facing a midlife crisis, and Mikhail is being released from pre‑trial detention. Meanwhile, a new supply manager appears at the school.

Mikhail is helping Bogdan with the sculpture competition to impress Maria Pavlovna.  The director is trying to get the team interested in football, and Natalya is once again quarreling with her mother over past grievances.
 

The director is struggling with the divorce, so Mikhail comes to his aid. Natalya is trying to set her ex‑husband up with a biology teacher, and because of Maria Pavlovna, a scandal breaks out at a meeting of the literary club.

Yan is preparing a themed date for Nastya, while the girl herself wants to go to a concert by a famous band. The principal is introducing new innovations at the school in the form of a robot cleaner, which causes Maria Pavlovna to be indignant.
 

Natalya, with Veronica's help, plans to bring Nastya back home. Maria Pavlovna falls victim to scammers, but not without the help of an acquaintance, and the director organizes annual joint lessons.

Natalia is going to an important award ceremony with the director to protect him from foolishness. Nastya is upset with Yan, but she invites him to play a game together. Maria Pavlovna meets her old friend and arranges to have dinner with their families. Now she urgently needs to find a husband for the evening.

The supply officer and Leonid are trying to save Maria Pavlovna from the fraudster. Natalya agrees to go to dinner with Boyan, and Danya decides to put an end to the historian's suffering and performs a noble gesture.

Maria Pavlovna and Leonid are preparing for a joint performance, while Natalya continues to try to befriend Veronika. Meanwhile, the other teachers are afraid that the principal has contracted a dangerous illness.

Boyan and Natalya are going to a country hotel, where they unexpectedly run into Veronika and Vlad. Maria Pavlovna is trying to re‑educate the zoomers, and the housekeeper is getting ready for the wedding.

The custodian decides to move to the Arctic and resigns. Maria Pavlovna wants to get him to come back. Natalya volunteers to help her mother, while the principal and the other teachers organize a search at the school. 

Maria Pavlovna forgets Nastya's birthday, so the girl decides to use this to her advantage. However, things unexpectedly don't go according to plan. The quartermaster tries once again to impress Maria and prepares an unusual gift.

Mikhail and Leonid are trying to find the perfect man for Maria Pavlovna. Nastya is "reaping the rewards" of a heart-to-heart conversation with her grandmother, while Natalya and Vlad want to correct a mistake they made.

The principal is recording a school podcast with a surprise guest. Natalya is worried that the whole school knows about her personal life. Maria Pavlovna helps the students organize a concert at a club run by one of her former students.

Because of Natalia's strange behavior, Nastya begins to suspect that her mom is seeing someone. A legendary cosmonaut visits the school, and Mikhail dreams of introducing him to Maria Pavlovna.

The school is hosting a charity fair to support a dog shelter. At the fair, Maria Pavlovna and Natalya are holding a pie-baking contest, while Nastya is trying to sell tickets to Bogdan's concert.

Leonid's girlfriend breaks up with him, and he falls into a deep depression. Maria Pavlovna and Mikhail try to help him, each in their own way. Natalya travels with the principal to an education forum.

The season finale! A new astronomy teacher, Valery Mikhailovich, arrives at the school and tries to build a relationship with the math department. Bogdan and his team are preparing for their long-awaited concert, and the whole school accidentally finds out about Vlad and Natalia's relationship.