It's nearly time for the Saikai Academy ball sports tournament, and Yukina and Nagisa are all fired up to act as cheerleaders! And thanks to the workings of Motoki and Rin, Kojou and Asagi are paired up to participate in the badminton doubles match for their class. Meanwhile, Natsuki is occupied with the capture of some therianthropes that have appeared in the warehouse district, and someone is targeting the Fourth Progenitor again...

Kojou and Yukina meet Dimitrie Vatler, a nobleman who shows an abnormal degree of affection toward the Fourth Progenitor, and Kirasaka Sayaka, Yukina's old friend also under the employ of the Lion King Organization. When Vatler proposes that Kojou capture some terrorists hiding out on Itogami Island and Yukina volunteers to take care of them instead, Vatler challenges Yukina to test her suitability for the task. And, though Sayaka has always been a friend of Yukina's since childhood, her behavior starts to change...

In her excessive defense of Yukina, Sayaka launches an attack on Kojou, but he can't control his powers. Yukina's arrival prevents the situation from growing dire, but Yukina leaves them both on the school roof to think about what they've done.

Gardos the terrorist has reawakened the ancient weapon, Nalakuvera. Kojou and Sayaka barely escape with their lives, but they fall into the depths of the manmade island. Asagi hurries to analyze and control Nalakuvera while Yukina fights a fierce battle to stop Gardos.