Ever since the Demon King prophecy, Akuto Sai has had nothing but bad luck. He's still having trouble controlling his magic, and to make matters worse, he yet again ended up blowing off Junko Hattori's clothes. While attempting to train his mind through meditation, he finds an ancient treasure map. Not wanting to deal with yet another distraction from his studies, he tries to keep the map a secret, but to no avail. Once the map leaks out, the school breaks out in chaos as the students try to find the lost treasure.

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.

 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!

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...

Akuto Sai and his classmates are off on a school seaside retreat, but even here, he cannot escape the looming prediction that he will become the Demon King. The island they travel to has a legend about a hero who will defeat the Demon King... could it be true? And to make things even more complicated, why is the normally cheerful Hiroshi so bitter about his family... and even stranger, why is Korone suddenly trying to seduce Akuto? So much for a quiet, ordinary school life.

Akuto Sai's life is about to get even more complicated. Junko Hattori invites him to visit her family home, without telling him that the occasion is an arranged marriage meeting -- for an arranged marriage between Junko and Akuto! Meanwhile, an assassin comes to Constant Magical Academy, targeting the air-headed Keena, of all people. Who is behind this assassination order? And most importantly... how will Akuto react when he learns of this plot? Prepare to see a darker, angrier Akuto in Volume 4 of Demon King Daimaou!

Diablo, Rem, and Shera have arrived at the Bridge of Ulug only to discover that an army of Fallen are marching towards Faltra! This should be no problem for a powerful Demon Lord like Diablo...except that Diablo is actually Takuma, a video game addict who's in way over his head. Will Diablo's stats hold up in a real-life battle?