In this world where magic and aura exist, there are also monsters. Creatures that emanate fear and terror, those that make skin tremble, and their mere presence causes fear to take over body. Over the centuries, humans learned to stand up to and kill monsters, and the most famous group was the "five swords." A group of five people, including Satoru. Their swords were called sacred. As the monsters grew in number, Satoru and the rest of his group decided to deal with the main problem, the demon king. The demon king lived in a dungeon, entry to which was strictly forbidden. The mention of his name made monsters tremble, and the name of the strange king was Suguru Geto. There were many legends and rumors about him, but no one had seen him.

The "five swords" learned a lot while clearing the demon king's dungeon, but when they reached the last level, they were stupefied by the beauty of this very king. No one knew how such a handsome and fragile-looking young man could be a monster. Satoru swallowed and walked out first, looking at the king — "Either we kill you, or you stop sending monsters to human lands!" — Satoru said firmly