By a strange turn of events, the boy Ruisha finds himself trapped in an alternate dimension created by the Hero.

There, he incredibly encounters none other than the Demon Lord and the Dragon King, who were supposedly defeated by the Hero three hundred years ago!

Ruisha befriends the Demon Lord and the Dragon King, and trained by them, he undergoes an astonishing transformation from a frail boy into the "Demon Dragon Warrior," a legendary fighter wielding the combined powers of demons and dragons. Having escaped the alternate dimension using his newfound power, Ruisha enrolls in a magic academy rumored to house the Hero's descendants, all to rescue the still-sealed Demon Lord and Dragon King.

Having been trained by the Demon Lord and the Dragon King for an immense amount of time, Ruisha is about to wreak havoc at the magic academy!!

*Volumes 1-4 of the book version are currently on sale to great acclaim from Overlap Bunko. The release of Volume 5 has also been decided!!