2V, with the newly-awakened First Demon King, Zero, has successfully taken over the Empire. All Liradans, including Korone, are under her control. And with Akuto out of commission and no one allowed to use magic, no one can stop her from commanding every aspect of the citizen's lives. What is 2V's true goal behind creating this Liradan-centered, magicless society? Meanwhile, the injured Akuto has taken refuge in a black mage village with Fujiko, Keena, and Yoshie. What will he do when he meets someone who holds the secret to his mysterious birth...?

2V has come up with a plan to kill Akuto using virtual phase space, and he recruits the teenage genius scientist Yoshie Kita to help. Akuto and the rest of the school are sealed in a game of Yoshie's creation, and to make it out, he'll have to play the role of the Demon King and battle against the other students. But there is another secret hidden inside the game that breaks all the rules...

 Empress Kazuko, after killing her sister 2V, is revealed to be the true villain. Using the power of Zero, the First Demon King, she intends to enslave humanity. In order to save everyone, Akuto knows that the line of Demon Kings must end — and for that to happen, both he and Zero must die. Will Akuto and Brave be able to defeat Kazuko and Zero? Will Junko, Keena, and the others survive this battle? And what does the member of CMID-8, "USD," have to do with all this? Read the epic climax of the war between Demon Kings!

In the transformed world, Demon Lord Ard squares off against Alvarto, mightiest of the Four Heavenly Kings. Yet, just as their fated showdown nears a brutal, tragic conclusion, the voice of someone dear to Ard sounds across the battlefield! The saga of the Demon Lord versus the Four Heavenly Kings is reaching its climax, but who will be left standing?

Far in the future, Japan has become a land ruled by magic and those who wield it. Akuto Sai arrives at Constant Magical Academy--the most prestigious magic school in the world--for his first year of high school. The only student to pass the Academy's intense entrance exam, he has his sights set on become a High Priest, the most powerful and virtuous magician in the land. However, when he arrives at the Academy, his future occupation is prophesied to be... The Demon King?! Now Akuto is the number one target on campus, and he must navigate his way with the help of his friends--a troublesome delinquent, a beautiful observer android, an honor-bound class representative, and a mysterious girl from his past--through the seedy underbelly of the world's premier magic academy.

Constant Magical Academy has a new transfer student named Keina Doronz. Not only does she have almost the same name as Akuto's friend Keena, but she also has an identical bird-shaped hairpiece -- the same one that Akuto bought for a crying girl when he was a child. Who's the real girl from his memory? To make things more confusing, this unknown girl is demanding that Akuto take her on a date! Hilarity and magic school shenanigans ensue when Keina joins Keena, Junko, Korone, and Fujiko as they circle around our favorite hapless Demon King, Akuto Sai.

Akuto has awakened as the Demon King, and has declared that he will kill the gods. Now he faces thousands of troops, Eiko Teruya, and his friends, Junko and Hiroshi. Meanwhile, Keena may hold the key to the future of humanity itself.