In 1923, Major Yoshinobu Maeda arrives in Tokyo to question a confused actor who is crushed by a falling prop and revived as a vampire.

Maeda meets the vampires under his command for the first time, including an old classmate; their first mission: hunting down a vampire couple who have been attacking humans in Tokyo.

Yamagami and Kurusu contemplate their new vampiric lives as it sinks in that they're now legally dead. The army brass pressure Maeda and Nakajima for results, aiming to cut funding for Code Zero.

Kurusu still struggles to use his vampire powers in combat as Code Zero investigates a series of strange deaths in the Yoshiwara red-light district.

While Maeda convalesces, officials move to disband Code Zero and replace them with a force of British vampires; with less than a month until the deadline, Code Zero tracks the barrels of Ascra to Yokohama.

Takeuchi and Suwa follow the mysterious vampire units; Yamagami and Kurusu return to base, where they are surprised to find Maeda; Nakajima reveals his true plan.