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1000 years ago The world was filled with cruelty, evil, and bloodlust. The source all evil was the demon lord, the strongest and highest ranking demon. The hero, Minami was tasked to eliminate him along with 4 other heroes. But before they could challenge the demon lord, they must first defeat his 7 generals who represent the seven deadly sins. Each one has their own unique strength and weaknesses. One year later, six of the demon generals were slain and the only one left ran back to the demon lord's castle. He was his son Philip, the successor of the throne and the next demon lord. In order to survive, his father, the current demon lord, sealed him in a rock and cast a protection spell on it so that it will never be opened for a thousand years. The humans on the other hand, had successfully slain the demon lord and it's generals, remained peaceful for a thousand years. However, little did they know that a new threat was about to begin.