Luli gets a scholarship at Colégio Tamboril. On the first day of school, Luli does an activity with Breno and Gabi. Fiorella, the popular girl of the school, finds Luli snobbish and decides to sabotage the group.
Luli, Breno and Gabi discover that their work has been deleted. To fix things, Luli improvises and is applauded by everyone after her presentation. At the end of the night, Luli tells her family about her day and they celebrate together.
Luli is uncomfortable with the pollution and decides to promote an awareness campaign in her school. Failing to engage classmates, Luli invents the Garbage Monster, but soon, the rumors gain greater proportions than expected.
Luli and Gabi are called to the principal's office and asked about the monster. The principal calls an emergency meeting with the parents. Luli confesses that she created the monster, and after explaining her reasons, she is forgiven.
Luli starts running for class representative. Fiorella and Felipe are also candidates. Fiorella challenges Luli to the competition. Luli makes exaggerated promises in order to win, and Gabi warns her about her arrogant stance.
Luli is asked about the viability of her promises. In the debate, the confrontation between Luli and Fiorella is booed. Sad and alone, Luli decides to vote for Felipe, who wins the election. Luli makes amends with her friends.
The teacher gives a family tree assignment, and Luli tries to find out if one of her relatives has done anything important. Luli's grandmother arrives with more information, but none of her relatives lives up to her expectations.
The teacher wants to know about Luli's choice, but she tells her that she is still researching. Luli discovers that her great-grandmother invented the brigadeiro. She chooses her grandmother as her theme and gets a ten.
Rodrigo pranks Luli constantly, and she resents having a brother who only provokes her. Luli chooses drawing as an extracurricular activity and ends up in the same class as Rodrigo. The teacher chooses the two as a pair in an activity.
At home, Luli and Rodrigo fight. Luli discovers that Rodrigo draws very well, but he doesn't think he's good enough. The two unite. Luli and Rodrigo get a ten in their drawing class with an illustration of their father.
Gabi hopes her parents will reconcile and resents her mother's boyfriend. Gabi invites Luli and Breno for a barbecue. Gabi's father arrives with his girlfriend. The two couples get along well. Gabi has a plan to ruin the barbecue.
Gabi, Luli and Breno come up with a plan. Gabi tries to bring back good memories, but the two always end up remembering something bad. Luli convinces Gabi that their relationship is better now, and the day ends well.
Vitor Hugo, the nerd, loves exam week. Luli accepts the challenge to achieve better grades than Vitor Hugo. They end up with the exact same grade, and the principal calls them to his office in order to find out who cheated.
Neither of them admits to cheating. The principal calls the families. Nothing gets resolved. They set up a law court in the playground. Victor Hugo confesses that he was the one who cheated. Luli forgives him.
Luli studies math so she can get a ten. Breno prefers to play tetherball. He gets a ten in the test and Luli gets a 9.75. Breno starts getting a lot of attention. Luli gets angry until she is chosen as Breno's backup in the math Olympics.
Luli plants a news story and exposes Breno. Breno admits the accusations were true and becomes a hero. Luli realizes that she was wrong and apologizes. He confesses that he guessed every answer in the test. Luli goes to the Olympics.
The principal announces a career week. Students must take someone from their family to school. Fiorella dares Luli to take Diana. Luli realizes that she doesn't know what her mother does. Diana invites Luli to spend a day with her at work.
A homosexual couple looks for Diana to thank her for the adoption of their daughter. Luli understands what her mother does. Diana reveals that she won't be able to attend the presentation, but in the end, she manages to participate.
Fiorella invites Luli, Breno and Gabi to spend a day with her family. They arrive at Fiorella's house and are greeted by her parents ostentatiously. Beatriz and Fiorella talk about what they are going to do with Luli after lunch.
Beatriz and Fiorella start their plan against Luli. With a hidden camera in the room, Beatriz reveals that the house is haunted. Fiorella walks out wearing a costume and scares everyone, but Beatriz forgets to record it.
Luli rolls brigadeiros for her slumber party. Luli's uncle takes his daughter Clarinha to lunch. Clarinha gets ready and proposes a game that Luli, Breno and Gabi detest. To everyone's surprise, Clarinha goes to the slumber party.
Clarinha spoils the games at Luli's party and eats all the brigadeiros. Clarinha manages to make everyone fight. The children realize that it was all her fault and call Carlinhos. Clarinha leaves and the children resume the party.
Hélio wakes the children up to announce that he is going to propose to Diana. He explains that they are practically married, just not on paper. Hélio leaves for the wedding proposal. Luli worries about what can go wrong.
Luli tries to maintain order, without success. Diana accepts Hélio's proposal. She asks about the children and Hélio realizes that he forgot about them. They call to say they are coming back. The children hurry to clean everything.
Luli hands out invitations to her birthday party at school. Children rehearse for a choir performance. The children are out of tune, and the teacher gets desperate. The conductor arrives to help.
The choir performs and it is a success. Luli thinks that no one will attend her birthday party. At the party, after a magical surprise, all of Luli's friends show up, and Luli celebrates the most incredible year of her life.