Taking place after the defeat of Zhan Tiri, Varian and his girlfriend Harmony have begun settling into their new lives as the Royal Engineer and Co-Queen of Corona respectively. One day, Varian finds a journal that once belonged to his mother Scarlett, and, after confronting his father Quirin, learns that Scarlett and another woman named Donella completed a series of trials to collect totems hidden within each of the Seven Kingdoms to rebuild an ancient device that will reveal the location of the Eternal Library. Realizing that his mother may still be out there somewhere, Varian decides to go on a quest to complete the trials himself. Harmony discovers that she is also connected to the trials somehow and accompanies her boyfriend on the journey, as the trials require both alchemy and magic working as one. Along the way, the two face hardships, learn valuable lessons, and make friends and enemies, both old and new.

Rapunzel comes back to Corona and meets her sister, Princess Harmony. They have all sorts of adventures while adjusting to life and each other with their friends as they try to solve the mysteries of their new looks and abilities and Rapunzel And Harmony is destined to one day assume the role of Princesses of Corona, but They not ready for that yet. They realizes that there is so much more They needs to learn about both themself and the world before They can take on the responsibility associated with being Princesses. So They goes on a journey to ready Themself for eventually ascending to the throne and is joined along the way by partner-in-life And Love Interest Eugene And Varian, no-nonsense and dutiful horse Maximus And Sliver, and tough-as-nails friend and confidante Cassandra.