There is a rumor circulating about the Seven Wonders of Kamome Academy. Nene Yashiro and her classmate Kou Minamoto work with Hanako-san to uncover a traitor among the Seven Wonders. After destroying No. 2, the Misaki Stairs, and No. 5, the Four O’Clock Library, only five remain. Can they discover the culprit before it’s too late?