Strike the Blood III

Kojou and the others return to Itogami Island after resolving a crisis on the mainland, only to find ships suffering unexplained accidents, aircraft unable to approach, and the island rapidly becoming isolated from the outside world. Yukina suspects a large-scale magical formation, and Natsune recognizes the signature of a terrorist organization known as Tartarus Lapse.

The blockade is only the opening move. Nagisa is still suffering from the consequences of previous supernatural events, while new attackers use the island itself as part of a plan that reaches into the history of the Fourth Primogenitor and the forces surrounding him. Cut off from outside support, Kojou and Yukina must protect Itogami while uncovering why the terrorists chose this moment to strike and what they intend to awaken through the chaos.