The book version is now available from Kodansha K Ranobe Books!

Additionally, a comic adaptation has begun serialization on Niconico Seiga. We'd love for you to give it a read!

Volume 1 of the comic will be released on October 9th!

—Though he only wanted a small room, what he ended up creating was a vast and powerful dungeon.

Chrono, an ordinary demon, creates a dungeon at the Demon Lord's Castle Academy.

Upon turning twenty, it was the custom among demons to build a dungeon in the Demon Lord's Castle, live there while dedicating themselves to their studies, and achieve independence.

Chrono, for his part, created it thinking a small dungeon would suffice—but what was completed was a colossal edifice spanning hundreds of floors.

It was on an unbelievable scale, surpassing even dungeons built by legendary Demon Lords.

“All I need is a small dungeon...!”

Chrono, who yearned for a normal, easygoing life, quickly became the center of attention and rapidly rose through the ranks of the demon race.

Eventually becoming known as a hero.