Chizuru, still embarrassed that she has lost her most precious assets, samples some of the rare and unique foods and drinks that her brother Tayura found in his 3-day quest around the world that should help restore her features. To her disappointment, none of the items work, and she decides to treat Kouta and friends to a special dinner at a family diner on the outskirts of town. The twins, Ren and Ai, who have given up on their mission after once again failing to kill Chizuru, are invited to join her, Kouta and others for dinner.
Minori, who by now is sick of witnessing the continued failures of the twins, decides to enact her own method of freeing Kouta from Chizuru...by attacking Kunpo High School itself! With a massive army of demons and evil spirits at the front door, the humans inside are trapped in a war that they never know is happening! Can Kouta, Chizuru, and friends help bring the war of monsters to a peaceful end before the school is demolished? Or will Kunpo High School and their relationship with each other be forever destroyed when Minori finally puts a end to Chizuru's life and reclaims Kouta as her "brother"?