Plot
Cinta is a popular teenage girl living a comfortable lifestyle. She is gifted and accomplished, surrounded by a group of faithful friends consisting of the wise Alya, the tomboyish Karmen, the sassy Maura, and the ditzy Milly. She also has caring and supportive parents. The friends cry on each others' shoulders for Alya, who is the victim of domestic abuse by her father. Cinta recites the group's pledge to the buku curhat, a diary/scrapbook shared by the girls, that a problem one of them is going through is to be shared with all of them.
Cinta is a school poet who has been honored for her work, and, in her final year of high school, she submits a poem to the yearly poetry contest. However, much to the students' surprise, Cinta does not win - the grand prize in the contest is awarded to a boy named Rangga, whose name is not well known in the school. Rangga, rather than going to the podium to receive his prize, takes offence and retreats to a hiding spot. Cinta is somewhat jealous of Rangga's unexpected victory but is careful not to show it. This leads Cinta to search for Rangga and request an interview for the school bulletin. However, Rangga immediately detects insincerity in Cinta's congratulations and walks away, leaving Cinta to be irritated by his perceived arrogance. As it turns out, Rangga never entered his poem for the contest; it was submitted on his behalf by his only best friend, the school janitor Mr. Wardiman.
Cinta and Rangga start to dislike each other, and so do her friends. They briefly warm up to each other after Rangga thanks Cinta for returning his book. It doesn't last long since Rangga offends Cinta in a bookstore. When Rangga tries to apologize to Cinta the next day, he is beaten up by Borné, a guy who had been trying to start a relationship with Cinta. Rangga and Cinta start to become friends when Cinta visits Rangga in his house, where she discovers that Rangga lives in a lower-middle-class neighbourhood with his father Yusrizal, whose outspokenness has led to bomb threats from pro-government thugs. Moreover, his parents divorced because of his father's dismissal from a government office for exposing government corruption. Alya, who regularly tells Cinta her broken home problems, is the only one Cinta tells of her budding closeness with Rangga.
The secret friendship causes changes in Cinta's behaviour, resulting in problems with Cinta's group of girlfriends. She starts to regularly lie to her friends in order to spend more time with Rangga. The problem reaches its climax when Cinta ignores Alya's desperate request to talk with her because she is going on a date with Rangga. When she comes home, she is told that Alya is in the hospital because she attempted suicide. At the hospital, the friends realize that Cinta has been lying all along, straining their friendship. Thinking it was all her fault, Cinta then shuts Rangga out, hurting him. When Alya recovers, she discusses Rangga with Cinta, which Karmen, Maura, and Milly overhear and finally discover the formerly budding relationship between Cinta and Rangga. Cinta apologizes to them and Maura advises her to forget Rangga.
Cinta does so, and goes on with her life. Meanwhile, Karmen sees Rangga give Mr. Wardiman a goodbye hug. Noticing that Cinta has turned quiet and uncommunicative, her friends realize the error of their ways and Cinta confesses that she is in love with Rangga, but is not ready to admit it. Karmen tells her she doesn't have much time since she saw Rangga leave. Mr. Wardiman tells the girls that Rangga is heading to the airport. In a rush, they force their nerdy schoolmate Mamet to lend his car so they can go to the airport. Cinta manages to catch Rangga, as he and his father are moving to New York City. They profess their love for each other and share a kiss, but Rangga has to go, leaving Cinta heartbroken. Before departing, Rangga gives Cinta a book and tells her to read the last page. They bid each other one last farewell, and he boards the plane.
In the car, Cinta reads the last page, which contains a poem Rangga wrote about her. The last line says that he will return before the full moon. Suddenly, the girls freak out when they realize they have left Mamet at the airport.
