In the vast universe, there are countless spaces. Humans and vampires coexist peacefully, and some people don't even know that vampires exist. Vampires don't want humans to know either. Humans and vampires live peacefully in this way.
Until, there was the group "Thorn Society". The "Society of Thorns" is composed of many crazy vampire fans. They continue to encourage people to catch vampires and call them "Vampire Hunters."
If you don't explode in silence, you will die in silence. The vampires can't stand it anymore. If this continues, they will soon become extinct.
A war breaks out, a war between humans and vampires.