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.

Every branch of the Knights of the True Cross is thrown into chaos as Lucifer, the King of Light, declares war. At the same time, Yukio, Rin, and the other Exwires leave for Izumo's hometown in Shimane Prefecture to bring Izumo and Shima back home. Izumo has been kidnapped and confined in the Far East Laboratory, controlled by the Illuminati. As Izumo awakens, she finds Shima wearing an Illuminati uniform. Then, she also meets someone with whom she shares a deep connection.