Once he was a college student. Now he must become a samurai.
Yamada Yuuki was an ordinary Japanese college student with an extraordinary hobby: the classical samurai martial arts.
Until the fateful evening a demon summons his dojo to another realm.
There is only one way home: to join forces with his fellow humans to conquer the world-spanning dungeon. In their path are bloodthirsty beasts, treacherous traps, and malicious magics.
Through fire, faith and steel, they must win a way home — or die trying.