"No rest for a primogenitor ... It's a new term at Saikai Academy, and fortunately for Kojou, he hasn't been held back a year! Freed from his constant work defending Itogami Island, he is ready for some peace. However, an entirely new demon beast appears, and when Rui and Yuno are dispatched to deal with it, they are gravely wounded. Kirih forms an unlikely alliance with Shizuri, who is dead set on avenging her friends. Meanwhile, the Japanese government has concerns about Yukina's ability to continue observing the Fourth Primogenitor, so the Lion King Agency readies a replacement. As Yukina frets over this threat to her position, her stress only grows with the arrival of a mysterious girl who looks exactly like her!"--