Yuuichirou's choice fractures everything you thought mattered. He has the power to save Mika, but using it means becoming the weapon of the people hunting vampires, the same institution that made Mika what he is. The show doesn't pretend there's a clean answer, and neither does it let you hide behind one.
Yuuichiro finally locates Mikaela after months of searching, only to discover his childhood friend has been transformed into a vampire. Desperate to save him and protect the human resistance, Yuuichiro throws himself into mastering his cursed weapons while pursuing any lead on reversing vampirism. His superiors have darker plans in mind. Command intercepts intelligence that the vampire nobility will launch a full assault on Tokyo within weeks. To gain tactical advantage, they dispatch their strongest soldiers to Nagoya, where a crucial battle will determine humanity's survival. Guren marches toward the front lines with his demon-cursed sword, while Yuuichiro's personal mission collides with military strategy. The gap between what Yuuichiro wants and what the military demands grows wider as the clock ticks down. Every demon summoned, every vampire slain, and every moral compromise edges them closer to a truth neither side anticipated. War transforms soldiers into something else entirely, and Nagoya becomes the crucible where everyone learns what they're truly willing to sacrifice.