Akuto Sai is an orphan with a lofty ambition: to graduate from Constant Magic Academy and join the elite national magic clergy to make the world a better place. However, during his mandatory entrance aptitude test, the school’s high-tech oracle prophesies a shocking destiny—Akuto is destined to become the Demon King. This revelation instantly transforms him from a hopeful scholar into a feared pariah, alienating his classmates and drawing the intense scrutiny of the government and mystical organizations.Despite the overwhelming social backlash, Akuto strives to live a normal, peaceful life. Along the way, he unintentionally gathers a fiercely loyal, eccentric circle of companions. This includes Junko Hattori, a fiercely honorable ninja student who initially vows to keep Akuto in check but grows to respect him; Pure Ghost, an innocent android girl assigned to monitor him; and Fujiko Eto, a manipulative class representative with her own dark agenda. Akuto also captures the romantic interest of Korone, a mysterious government
surveillance beast-girl. Instead of turning to evil, Akuto resolves to use his immense, uncontrollable dark powers to defy the oracle's prediction.As the semester progresses, threats mount from all sides. The government, terrified of the Demon King’s prophecy, plots Akuto’s assassination. Meanwhile, extremist factions and ancient beings attempt to manipulate or force Akuto into embracing his malevolent destiny. The dramatic tension peaks when Akuto discovers that the world itself is essentially a massive, highly controlled virtual reality simulation created by an
advanced civilization. Within this system, the role of the "Demon King" is a hardcoded safety valve meant to reset the corrupted world when humanity goes astray.Akuto confronts Peterhausen, a legendary dragon bound to his soul, and battles various powerful adversaries, including the hidden mastermind behind the academy’s sinister experiments. Throughout these escalating conflicts, Akuto struggles with the philosophical weight of his existence and whether free will can truly overcome predetermined fate.In the climactic resolution, Akuto rejects both the destructive path of the traditional Demon King and the tyrannical control of the simulation's creators. Instead, he decides to become a benevolent, unconventional Demon King who protects the outcast and changes the rules of the universe entirely. By embracing his immense power on his own terms, Akuto secures a future where humanity can forge its own destiny, effectively rewriting the prophecy and uniting his friends in a new era of freedom.