Once upon a time, in a world where witches and bad forces coexisted alongside humanity... When the dragon's wings always cast a shadow over the sky. Dragons are vicious predators that prey upon humans, other creatures, the undead, and other animals. All living things shudder at the thought of dragons.People became sick of dragons one day and decided to do something about it. No one volunteers to face the dragons, and it takes a troop of anonymous knights to do it. They intended to eliminate dragons to alleviate people's anxiety. And you, are you ready to become a Dragon Slayer?