Amelia, a kingdom of war and magic led by Queen Amelia, monopolizes the extraordinary power of magic and repeatedly invades other countries in a time of war. Even in the prosperous small country Campusfellow, known for its farms and blacksmiths, the flames of war are approaching. If things go on like this, Campus Fellows will perish.

For the sake of the country's survival , Lord Vad Grace decides to take a devious measure by recruiting into his ranks a group of vicious witches who are known as “disasters”, who have left behind numerous terrifying tales. Raised as an assassin, the boy Black Hound, who has been trained in all kinds of assassination techniques, throws himself into the impossible tasks to protect his country and lord.