Series numeration from Goodreads.com.

"Months after saving suburbia from destruction, our heroes are back to their old lives of dungeon delving and magical quests. All except the wizard Albiorix, who has given up adventuring and uses his time trying (unsuccessfully) to create his own board game. When the party finds their old friend June Westray's smartphone for sale in a Br©Ưandal©œrian bazaar, however, they fear the Realm of Suburbia is under threat. Thus, the five young adventurers must travel back into Homerooms & Hall Passes, a role-playing game where they assume the characters of average American kids. This time they're at Level 9 and will face a whole new set of challenges: their freshman year of high school!"-- Publisher's description.

008-012.