13-letna Kayla Day ves čas visi na telefonu in snema videe z nasveti vrstnikom. V njih z navdušenjem razlaga, kako naj premagajo občutke osamljenosti, negotovosti in nevidnosti. Težava je, da teh posnetkov nihče ne gleda, še več, tudi Kayla se težko znajde, ko jih mora sama prevesti v resničnost. A njenih stisk naj bi bilo kmalu konec: osnovna šola se končuje in Kayla upa, da bo na srednji šoli vse drugače. Pred tem pa mora preživeti še povabilo na rojstni dan najbolj popularne sošolke in se predvsem sprejeti, kakršna je.
In his feature film directorial debut, comedian Bo Burnham deftly encapsulates the awkwardness, angst, self-loathing and reinvention that a teenage girl goes through on the cusp of high school. Given that the 27-year-old stand-up comic achieved fame as a teenager himself through YouTube by riffing on his insecurities, he is uniquely capable as the film's writer and director to tell the story of Kayla, an anxious girl navigating the final days of her eighth grade year, despite creating a protagonist female instead of male. Like Burnham did more than a decade ago, 13-year-old Kayla turns to YouTube to express herself, where she makes advice blogs in which she pretends to have it all together. In reality, Kayla is sullen and silent around her single father and her peers at school, carrying out most of her interactions with her classmates on Instagram and Twitter. Her YouTube videos are a clever narrative tool that provide insight into her inner hopes and dreams, much like an inspirational online diary. One of Eighth Grade's biggest triumphs is in its realism.