As Tegan becomes closer to Maya, she gains more perspective on her relationship with Sara. Tegan feels responsible for Sara at all times and it starts to weigh on her, especially compared to her friendship with Maya, which feels easy. Meanwhile, Sara struggles to balance her new friendships and interests with her relationship with Phoebe.

After a turn in her relationship with Phoebe, Sara is in a funk and can’t stop feeling sad. As a distraction, her new friends decide the best way to cheer her up is to take her to a rave. The idea of going to the rave is the first thing that’s made Sara look excited in a month, so Tegan feels obligated to go as well, despite her fears that they’ll get in trouble.

While stuck at home, grounded, Tegan and Sara discover Patrick's old guitar, and learning to play it becomes their new obsession. Not only does this launch them on their journey as musicians, but their newfound shared love of playing music begins to repair their fractured relationship.

As Tegan and Sara begin writing songs together, they start to bond and grow closer in a way they haven't been all year. This complicates Tegan's relationship with Maya, as Tegan chooses to spend more time with Sara than with her.

As Tegan tries to repair her friendship with Maya, Sara makes an effort to ensure that Tegan feels included by her and Phoebe by introducing Tegan to Phoebe's friend Cass. Tegan and Sara start performing their songs in front of more and more people, leading to an exciting opportunity and chance for them to take their journey as musicians to the next level.

As the school year ends, Tegan and Sara get ready to play their first live show at a party. But will a secret that Tegan must keep from Sara threaten their debut performance's success? Meanwhile, Sara still feels awkward after her fight with Patrick but is excited for summer to begin so she can spend more time with Phoebe. Tegan gets closer to Cass but also misses Maya.