Strike the Blood IV

Kojou wakes on Onrai Island with missing memories and a new observer, Shizuri Castiella Kasugaya, watching him instead of Yukina. The isolated district looks like a place for magical study, but the calm breaks through attacks by Debris and through signs that Kojou has been moved into a false arrangement. His familiar power fails, his past is blurred, and Shizuri’s role becomes harder to read because she is both guard and key to the incident. The island is tied to a larger conflict around the Lost Demon Sanctuary, artificial spaces, and forces trying to reshape control over Itogami’s defenses. Kojou has to recover himself while learning why Shizuri, Rui, Yuno, and the people around Koma College were placed near him.

The crisis grows from one island case into a struggle over primogenitor power, holy war plans, and the Twelve Beast Vassals. Yukina, Asagi, La Folia, Sayaka, Natsune, Kanon, and the others are pulled back toward Kojou as the incidents spread through night festivals, vampire politics, and hidden factions that want to seize what he carries. Avrora’s return forces him to face the origin of the Fourth Primogenitor again, while Shizuri’s blood servant pact shows how dangerous his power becomes when others are tied to it. Battles no longer revolve only around protecting Itogami from a single attacker. Each enemy wants a piece of Kojou’s authority, his memories, or his familiars. He keeps choosing the people in front of him over the role others give him, even when that choice makes him the center of another war.