At the dormitory caretaker's invitation, the boys become the mayor's whipping boys and start generating electricity in the sawmill. The girls go to the military complex for cooking practice - 400 men and three beautiful girls - sounds like paradise! Village disco, skinny dipping, animals-birds-insects, electric fence, and cow pie - everything has become new, interesting, and frightening to the youngsters who have urbanized in just a year. Of course, everything starts to go downhill from the very first day.

The dorm boys are now convinced that there are only celebrity photographers, celebrity chefs, celebrity chimney sweeps, and celebrity bottle collectors in the city. Stores sell celebrity cheese and celebrity jam, celebrity sausages and celebrity chewing gum. But fortunately, Andri, Tibu, Neeme, and Staff finally make it to the countryside, move into a convertible dormitory, and life finally kicks into gear! Vika, Marion, and Iris are greeted by 400 hungry soldiers.

The summer internship for the dormitory dwellers isn't as easy as expected - some of the promised funds are threatened to be taken away from the boys, and the girls struggle in the kitchen. Pauli can't reach Iris on the phone, but Iris has already reached another Pauli, Pauli Õige, a war veteran. The boys attend a proper village disco, which starts nicely but ends with a fight and an after-party at a drug farm - they get acquainted with the local eco-narcotic - jenkem.

Staff falls head over heels in love. Neeme is waiting for Elektra to visit, although the terrible eco-narcotic jenkem smell in his mouth can be felt several miles away. The boys start a combine harvester for fun but can't find the brakes. However, this is the least of their worries on this unfortunate day. The girls go on a field exercise to distribute food, but they are thrown out of the armored vehicle due to a fight. Iris decides that Pauli Õige is "the right one" and plans to give herself to him. The girls think Vika is a lesbian and are afraid to share a room with her anymore.

Marion and Vika's duel for Andri's affection must be decided by Andri himself - Marion invites him to visit her at the military complex. Pauli wants to go to the girls anyway because he's afraid Iris has someone else. In this case, he's right; Iris has found the soldier Pauli Õige, whom she plans to give herself to that very night. However, it turns out that the invited boys are not allowed onto the premises. Other ways must be used. Here, Iris's father's military drill training for Pauli comes in handy.

On the dormitory dwellers' final day of their internship, and things are completely falling apart. The girls are convinced of the hopelessness of their internship grade and organize a big mess to truly earn a bad grade. The boys must hand over their work at the sawmill to get the expected money, but Kustav orchestrates such a disaster for his friends that it cannot be salvaged. Love has let down Pauli, Iris, Neeme, and Kustav, but one of the dormitory dwellers loses their innocence.

The countryside-hardened dorm-dwellers are now back in the city. The old dormitory was closed due to the risk of collapse, and now they are facing a move to a new, Euro-renovated dormitory. The boys send Neeme to study in Germany to start the new school year as a trio. But upon returning to the dormitory, they are in for a surprise - their new roommate Virgo, aka Vigri.

Kustav and Andri decide to quit smoking and swearing. Tibu, however, has already become a changed man - Irma turned him into a real man. And now, Iris realizes she wants Pauli back. But first, they must exorcise the evil spirit of Irma from Pauli. The school is the last in the country in terms of academic performance, and the management conducts inspections in the dormitory to ensure that the youth are not engaging in immoral activities instead of studying. However, they have to deal with the dormitory caretaker Salme during the inspection.

The overcrowded dorm room is at risk of bursting at the seams. Pauli, who doesn't even fit into his own bed alone, plans to host the girl Irma, who has come from the countryside and is roughly Pauli's size, as an overnight guest. In addition, Andri's mother leaves her husband and comes to Tallinn, asking Andri for a place to stay. Staff suggests that Andri's mother could stay in the dorm room because a proper "milf" would only bring honor to any boys' dormitory. Kätlin keeps making increasing demands on the director and snaps a couple of compromising photos.

Andri, Kustav, and Pauli participate in a television weatherman competition. They believe victory is already in their pocket, and fame awaits because they have been individually invited. However, upon arrival, it turns out that the boys must also strip down to their underwear, as demanded by gender equality. Marion goes to a model casting, but instead of high fashion, she has to wear prostitute clothing. Virgo calls famous singers and gets a chance as a guitarist to audition for a band. Vika goes on a date, and Iris, left alone, begs to come along, promising to stay quiet, but she is not accepted. The dormitory caretaker's footing is shaky - the school inspection tries to discredit Salme to take her job.

Marion has been missing for several days. She was invited to be a model but has not returned to the dormitory yet, and her phone is switched off. The dormitory dwellers suspect that something has happened and decide to rescue Marion from the culprits together, using their collective wit and strength.

In the final episode of the dormitory dwellers' season, the dormitory caretaker Salme and the youth realize that now they have no choice but to stand together - "all for one, one for all" - otherwise, Salme will be fired, and the youngsters will suffer under the tyranny of the school inspector Valve. Vika cannot handle the emotional tension, gets drunk, and confesses to everyone whom she truly loves. As Virgo's behavior as a roommate doesn't improve, he is moved out into the corridor along with his bed. Through this, he encounters his true band. Surprisingly, this season has a happy ending!

The third season of the Ühikarotid starts with a big bang: Tibu gets an electric shock. In addition to his other phobias, this adds an electric phobia. But how would someone find work as an electrician with an electric phobia? Therefore, Tibu decides to leave the electrician course and switch to the girls' course, becoming a cook. The dormitory caretaker Salme gains an admirer. Love works wonders.

Tibu has electrophobia, and he also fears that he might have burnt his tool with an electric shock. Fortunately, it turns out to be a false alarm. Marion has a fear of men, and one man receives a letter of rejection from her. Iris thinks Tibu has a fear of relationships. We find out that Salme is afraid of spiders. However, Iris believes that a spider brings luck and that love will probably come to Salme. Iris is not mistaken.

Tibu and Virgo have made a bet on women, and the loser has to kiss the dormitory caretaker. However, Virgo needs to kiss Tibu to win the bet. Tibu doesn't realize that he loses either way, and to top it off, he gets caught kissing Virgo by Iris. The boys and Vika get caught in a compromising situation at the STD clinic. Tibu decides to switch to the girls' course, becoming a cook instead of an electrician.

Iiris finally breaks Tibu's secret with Cosmo's help - everything points to Tibu being gay. At the same time, the boys have arranged for a dancer for Tibu's birthday. With limited options, the dancer turns out to be dorm-Leena, from whom Tibu got the STD. Tibu's parents also attend the spicy party. Staff gets a new "legal" job offer, and Andri's father offers him a job as well. However, the boys must decide between money or friends, as the girls urgently need the boys' help. Namely, the new guys in the dormitory make an unwelcome visit to the girls' room, and things get out of hand.

Male chefs are more highly valued, and Tibu, who has just started cooking courses, is offered a job. He also invites the boys to work as waiters. Due to confusing circumstances, instead of waiter jobs, the boys end up having to strip in front of the public. However, they are refused payment for their clumsy strip, so the boys take their wages out in food since their stomachs are empty anyway.

Four dorm heroes and a baby it goes without saying who puts whose strength and skills to the test. After a long and exhausting struggle, Andri, Kustav, Tibu, and Virgo finally manage to conquer the baby. While watching over the sleeping baby, the boys find their softer side and believe that they will all become great fathers.

The dormitory caretaker Salme is in a romantic mood. She has said "yes" to her suitor, checked the info line to confirm there is no upper age limit for marriage, and has decided to make her dream of a white dress come true. Vika, Iiris, and Marion are giving advice on the bridal gown.

The dormitory caretaker and her suitor's wedding is in jeopardy. Marion breaks Virgo's heart. Andri's parents are divorcing. Staff and his brother are still on the run. The boys face expulsion from the worst school in Estonia. The dormitory caretaker is appointed as the guys' watchdog, and they have to clean the dormitory.

The boys face expulsion from school. They tie their ties neatly, straighten their collars, and embody first-rate sycophants.

Iiris falls under the influence of the manipulative Kätlin, Virgo and Tibu save the dormitory, and Andri sees the shadow side of his idealized father.

Ühikarotid have embedded themselves deep into the hearts of viewers over three school years. Why do we love them? Because everything always turns out like usual for them, even though they usually aim for the best. However, not everything is quite over - something can always go wrong again.