"The Land of Swordsmen."

That our land was once called such is a story from a very long time ago.

The skies of Hanyang, Joseon, where swordsmen with noble integrity and sharp blades at their waists whispered of great causes. When mysterious, giant iron cauldrons descended from beyond those blue skies, the fate of the nation was twisted forever.

Otherworldly goblins known as 'Amanto' (Heavenly People). Before the lightning cannons they unleashed, the swordsmen of Joseon were helplessly broken. Ultimately, to preserve its own life, the court issued the 'Sword Abolition Edict,' laying down its own blades. Swordsmen who lost their blades lost their spirit, and the streets of Hanyang became a chaotic mess of horned goblins and aimless vagrants with loosened topknots.

In a world where the era of the swordsman has set... However, there is one last swordsman here, still carrying his own noble 'Soul' at his waist with eyes that haven't rotted away. ...Or so I wanted to say grandly, but the reality is just one unemployed bum named Ban Eun-si, who's about to be hauled off to the Podocheong because he doesn't have a single coin for his tavern tab; a gluttonous monster kid named Ga-gu-ra, who steals rice by the cauldron; and a nagging pair of glasses, Shim Sin-pa.

In the middle of this lawless zone, there is an unofficial fixer shop called 'Mansao' (万事屋) that survives without paying a cent in taxes. And tonight, the voice of a man breaking through its doors echoed across the Hanyang sky.

"The Royal Secret Inspector is here—!!!"

A man with black hair and blue eyes, wearing his official uniform perfectly and carrying a sharp blade. The 'Demon Vice-Commander' of the Podocheong—the police agency also known as the Shinsengumi—whom everyone in Joseon knows: Ha Do-jin. Today, Hanyang is peaceful as usual.