Yukio Okumura, Rin's younger twin brother and Intermediate Exorcist First Class, is summoned to a high-level inquiry meeting of the True Cross Order to be questioned about Saburota Todo, the mastermind behind the resurrection of the Impure King. Suspicious of the imposing atmosphere, Yukio recalls the words of his late adoptive father, Shiro Fujimoto. Meanwhile, the Exwires are tasked with exorcising "Mayuko of the Toilet." However, Izumo Kamiki holds a certain grudge against Shiemi Moriyama.

True Cross Academy is busy with preparations for the school festival. Renzo Shima and Rin try to find partners to attend the music festival and dance party with, but they are continually rejected. Unwilling to give up, Rin attempts to invite Izumo. But she flat out declines because the annual Exorcist Certification Exam is approaching. However, Shiemi, who has passed the school's transfer exam and has become their classmate, appears before a completely depressed Shima and Rin.

Arthur A. Angel and Lightning capture a spy hiding among the Knights of the True Cross and learn that the secret society, the Illuminati, is planning to abduct someone for a certain project. And now, the time for their plan is at hand. After hearing the news, Shura Kirigakure gathers the Exwires. Meanwhile, Izumo confronts Takara and angrily explodes when she sees a particular stuffed animal in his hands...