The island of Regulus was once a prosperous and peaceful nation ruled by a royal family. The country was said to be protected by a dragon and an angel, which were depicted on the royal coat of arms. The kingdom’s history dated back thousands of years, and its inhabitants had complete faith in the reigning king and queen.

However around a decade ago, demons led by an archdemon who called herself the “Primordial Demon” suddenly appeared a decade ago and attacked the kingdom, annihilating the knights with their immense magical power and murdering the king and queen. The capital fell in one night amidst the flames and the island was put under the control of five of her loyal followers, known as the “Witches”.

Now, the witches rule by fear with their formidable powers. Even after over ten years, they have not aged at all, and have actually become more powerful instead of weakening over time. People thought that making a contract with them would result in eternal life and magic powers. While there was initial resistance against the demons, their numbers gradually dwindled as the islanders resigned themselves to the witches’ unjust rule.

Gilbert is a demon hunter who possesses demonic powers. He set foot on the island determined to defeat the demons who have possessed the five witches, as well as archdemon who controls them. What fate awaits him…?