In 1930s Tokyo, a clandestine war is brewing between humans and vampires. A group of vampire hunters, known as the Jaegers, are secretly employed by a shipping company to eliminate the growing vampire threat plaguing the city.
Yuliy, a skilled Jaeger with a personal vendetta against vampires due to the destruction of his home, joins the team. They operate under the guise of assisting the police, but their true mission is much larger.
The Jaegers are actually searching for a powerful artifact called the Ark of Sirius. Both they and the vampires are racing to find it first, as its power could drastically alter the world. Yuliy and his team must find the Ark before the vampires can use it for their nefarious purposes.