Friends Max (Jacob Tremblay), Lucas (Keith L. Williams), and Thor (Brady Noon), collectively known as The Beanbag Boys, are stepping into the challenges of sixth grade with unique personal struggles. Max is head over heels for his classmate Brixlee (Millie Davis), while Lucas grapples with the upsetting news of his parents’ divorce. On the other hand, Thor faces peer ridicule when his passion for singing is mocked by the popular student Soren (Izaac Wang), who constantly teases him for his "feminine" interests. The pressure leads Thor to stifle his true self and refrain from confronting Soren.
The trio's adventure takes a turn when they get a chance to kiss Brixlee at a party thrown by Soren. In a scheme to learn the ropes of kissing, they decide to use Max's father's prized drone to spy on Hannah (Molly Gordon), their teenage neighbor. However, their well-laid plan spirals out of control, resulting in the drone being wrecked and them inadvertently acquiring Hannah's stash of ecstasy pills during a chaotic encounter in which they attempt to reclaim the drone.
To dodge punishment from their parents, the boys skip school with the intent to buy a replacement drone at the local mall, while being chased by Hannah and her friend Lily (Midori Francis). Faced with the reality of having no funds, they contemplate selling Lucas's prized baseball card valued at nearly $600, but Lucas hesitates, leading them to make a desperate decision to sell Thor's dad's sex doll instead, which netted them a similar amount.
Their journey to the mall becomes increasingly frantic as they stop at a convenience store coincidentally frequented by a police officer. In a fit of panic, Lucas hands over the drugs to the cop, who mistakenly identifies them as vitamins. After numerous misadventures, they finally reach the mall, only to discover that Hannah and Lily have purchased the drone. In a twist of fate, the girls will only return the drone in exchange for the ecstasy that the boys no longer possess.
Desperate, they manage to procure more ecstasy from Hannah's ex-boyfriend Benji (Josh Caras), allowing them to trade it for the drone. Despite their success, Max faces the inevitable consequence when his father discovers the drone's misuse, resulting in him being grounded. An argument erupts among the friends, driving them apart, but Max selflessly takes the blame to shield Lucas and Thor from punishment.
Later, Lucas confides in his parents about his fears of losing his friends, who recognize that the boys might be drifting apart. That evening, Lucas persuades Max to sneak out to Chloe's party, cleverly reuniting all three friends. In a moment of triumph, Max kisses Brixlee, while Lucas and Thor cross paths with Hannah and Lily again—revealed as Soren's sister—who encourage Thor to embrace his love for singing.
As the school year unfolds, Thor secures the role of Stacee Jaxx in their school’s production of Rock of Ages, Lucas takes an active stance against bullying, and despite heartbreak from his relationships with Brixlee and Taylor, Max finds a new love in classmate Scout ([Zoriah Wong]). After an exhilarating performance of their musical, Max, Lucas, and Thor reconcile, reaffirming their commitment to remain vital parts of each other's lives.
