Welcome to East Highland, a fictional suburban landscape where the lighting is always neon, the hallways rotate in 360-degree spins, and the teenagers are navigating a raw, hyper-stylized journey through trauma and identity. Our unreliable guide is 17-year-old Rue Bennett, who kicks off the season by returning from a summer stint in rehab following a life-threatening overdose found by her younger sister, Gia. Despite the clean urine tests she secures using her childhood friend Lexi's help, Rue admits she has absolutely no intention of staying sober.

The emotional anchor of the season is the magnetic connection between Rue and the new girl in town, Jules Vaughn. Jules is a vibrant transgender girl who seeks validation in motel hookups with older men, including a terrifyingly intense encounter with Cal Jacobs, Nate’s father. As Rue and Jules grow closer, Rue finds that Jules is the only thing comparable to the high of narcotics, leading her to attempt sobriety for the sake of their relationship. However, Jules finds herself caught in a digital web, falling for an online persona named "ShyGuy118," who is actually a catfishing Nate Jacobs.

Nate Jacobs, the star quarterback, is the season’s primary antagonist, driven by a cycle of toxic masculinity and the discovery of his father Cal’s secret collection of homemade sex tapes. Nate spends the season manipulating those around him, including his on-and-off girlfriend Maddy Perez, whom he physically assaults at a carnival. To protect his family legacy, Nate blackmails Jules with explicit photos and coerces a local boy named Tyler into taking the fall for Maddy’s assault. Meanwhile, Maddy discovers a mysterious DVD in Nate's room containing incriminating footage of his father, setting a ticking clock on the Jacobs' family secrets.

While Rue and Nate battle their internal demons, the rest of the East Highland crew undergoes their own transformations. Kat Hernandez goes from a self-conscious fan-fiction writer to a confident, mask-wearing cam girl, reclaiming her agency while pushing away the genuinely sweet Ethan. Cassie Howard struggles with her reputation and a search for validation through male approval, which culminates in a painful pregnancy and a subsequent abortion after being shamed by her boyfriend McKay. Fezco, the drug dealer with a heart of gold, tries to protect Rue from the dangerous Mouse, eventually robbing a supplier to pay off a massive debt after Nate calls the police on his operation.

The season concludes at the Winter Formal, a night where every character's storyline reaches a crescendo. Kat finally admits her feelings to Ethan, and Cassie finds peace in being single for the first time. Nate has a violent, psychological breakdown during a confrontation with his father Cal, signaling the total collapse of their "perfect" facade. In a desperate bid for freedom, Jules asks Rue to run away to the city with her. They make it to the train station, but Rue realizes she cannot leave her mother and Gia behind. She watches the train pull away with Jules on it, returns home, and relapses into a hallucinatory, musical fever dream that leaves her future hanging in the balance.