At Otori Academy, the rival Kameyama and Otori families intensify their struggle for control while strange incidents begin to disturb the campus. Whispers of an iron-masked intruder spread fear among students, and Senna faces a bizarre, otherworldly threat. Mao encounters the masked figure and fights back without success, only to be rescued by Hitomi Kameyama. With tension mounting, the academy stands on the edge of greater danger as events unfold.