In this diary written during the COVID-19 pandemic, Princess Mia Thermopolis of Genovia records her most heartfelt emotions while dealing with personal and political battles, such as imposing health restrictions on her small European nation; living in lockdown; and dealing with her demanding grandmother.

In a series of humorous diary entries, fifteen-year-old Mia tries to figure out how to raise money for the bankrupt student government at her school while also worrying about how to become a "party girl."

High school sophomore Princess Mia records in her diary her struggles with geometry, the expectations of being a college student's girlfriend, running for president of the student council, and a potential ecological disaster in her native land, Genovia.

Twelve-year-old Olivia is a half orphan who's never met her father. Everything changes when Mia Thermopolis, Princess of Genovia, invites Olivia to finally meet her father.