There is a brand new student in kindergarten, and he is causing a major commotion among the girls in Room Nine. When a new boy named Warren joins the class, Junie B. Jones decides he is the handsomest guy she has ever seen in her entire life. Naturally, she wants him to be her boyfriend. There is just one giant problem: her best friends Lucille and Grace want him to be their boyfriend, too! To make matters worse, Warren thinks Junie B. is a complete nutball because she cannot stop laughing and rolling around in the grass. Determined to prove she can be a calm and sophisticated lady, Junie B. tries everything she can think of to win his attention. But as the competition between the three friends heats up, she realizes that trying to be someone else is exhausting, and maybe being her own hilarious self is the best choice after all.