Man is infinite, and his ambition is to slay the dragon

Zieger Fehr is a dragon hunter who hunts dragons and then eats them.
As a result of an accident, he met Brunhilde, who called herself the [Dragon Slayer System·Assisted AI], and set out on the journey of slaying dragons with her.
But after slaying dragons again and again, Sieg discovered that he seemed to have to slay more than just dragons?
[We will destroy all dragons! Kill all dragons in this world without leaving any! ]
[If there are obstructors, oppressors, betrayers, and deceivers, they are also dragons! ]
With Brunhilde's advice and guidance, Siegfried faced the reality and looked at the enemies standing in front of him.
"So, you're all dragons?"
"—prepare to die!"