20 years ago, the century long war between humans and demons was concluded. Six powerful heroes combined their strengths and slayed the First Evil: Demon Monarch, thus bringing peace to the world. Percival, the firstborn of 2 of the heroes, fights to prove his strength against the unreasonable expectations placed on him. His talents aren't any close to that of his parents, but he decided to try, dedicating his everything. However, the wall of talent remains unshakeable. On the day of his sixteenth birthday, Percival unlocks a suspicious system that defies the natural order of the world. Seven Evils System acquired. The System will prepare you for your role as a future Evil. It is then that his journey really begins.