And so the Battle of the Classes continues. Piggy and company have only just finished fighting for their lives against a vicious devil when a fiend ambushes them. To make matters worse, the fiend is a former DEC player with a shaky grasp on his sanity, and he traps Piggy on the twentieth floor. The exam isn't any easier for the rest of Class E as Class D is intent on sabotaging their efforts; meanwhile, nefarious clans are hatching deadly plots to end the class once and for all. Will Kano be able to save her brother's classmates? Even if Class E makes it through the Battle of the Classes unscathed, student council elections are right around the corner. Piggy will find himself in the middle of the political machinations of the most powerful factions of Adventurers' High. With conniving clans and scheming students on the scene, how much longer can Piggy keep his true strength a secret?