Juno tells the story of a teenage girl who becomes unexpectedly pregnant and decides to give the baby up for adoption. With help from her best friend Leah, Juno connects with an affluent suburban couple, Mark and Vanessa, who have been unable to conceive and are eager to adopt her unborn child. As Juno navigates this very adult situation at a young age, she relies on her supportive parents and friends to help her through the decisions and consequences of her actions.