A few years have passed since "dungeons" began appearing across the globe.

Ryosuke Mizuki, an average Japanese salaryman, is demoted and transferred to a rural branch office.

However, the branch he was transferred to had been engulfed and destroyed by a newly emerged "dungeon."

Driven by his corporate slave mentality, Mizuki dives into the dungeon just to punch his time card. After a series of twists and turns, he acquires a mysterious, overpowered skill and begins a cohabitation (?) life with a fairy he met.

Having achieved his dream of a free life, everything seemed to be going smoothly for Mizuki.

However, he soon finds himself caught up in an international incident surrounding dungeons...

[Notice]

Starting from Chapter 38, the content has been replaced with the book version.