Luna Thatcher is a student starting her second return year at the best high school in her town, Riverdale Academy. Well prepared, she has a list of must-dos and must-not-dos to help her survive high school, well, of course, before she meets Pier Dinsdale and Jack Langdon. Just a few weeks into it, high school life kicks off into high gear, while Luna must try her best to survive through the tangle of puberty, friendship, love, and relationships while keeping her studies in check.