There's a rumor going around about the Seven Wonders of Kamome Academy. Nene Yashiro and her classmate, Kou Minamoto, work with Hanako-san to expose a traitor among the ranks of the Seven Wonders. After breaking No. 2, the Misaki Stairs, and No. 5, the 4 O'clock Library, only five remain. Can they uncover the perpetrator before it’s too late?

Kamome Academy is rumored to have many mysteries, the strangest of which involves the mischievous ghost of Hanako-kun. When occult-loving high schooler Nene Yashiro accidentally becomes bonded to him, she uncovers a hidden world of supernatural beings. Now the two of them are conspiring to keep the peace between student and supernatural—that is, if they can only stay out of trouble themselves.