In Diary of a Wimpy Kid: No Brainer, the eighteenth installment of Jeff Kinney’s beloved series, Greg Heffley faces a new challenge: his middle school is on the brink of closure due to poor academic performance and a deteriorating building. Initially indifferent, Greg’s perspective shifts when he realizes that the school’s closure would separate him from his best friend, Rowley Jefferson. Determined to keep their school open, Greg embarks on a mission to save it, navigating the complexities of adolescence, friendship, and self-discovery along the way.