@Chrona
Interesting take:
Another one would be:
- Human military wanted to mass produce Byakudanshiki, but lacked a key ingredient (which is not written in the blueprint, every creator wants to keep the key ingredient secret)
- So, human military tinkers with exiting Byakudanshiki.
- Accidentally bricked the device....oopsie
- the story will continue with MC seeking out his siblings to stop them from going rogue.
Another one follows your premise with a twist:
- Vampire King did not charm military but some people in the military are supremacist and did the mass produce in secret
- Supremacist is grave digging and hunting original Byakudanshiki for secret ingredient.
- When they found it, they declare war
- Turns out vampire supremacist is doing the same thing
- World get into three sided war: Vampire Supremacist, Human Supremacist and Vampire-Human Alliance
- MC stuck in the middle with dilemma: Side with humans (as his original program) or with the vampire supremacist (as revenge for killing his mom) or take the moral high ground to be the advocator of peace for the 2 species (side with the Alliance)