The Hidden Dungeon Only I Can Enter manga volume 12 features story by Meguru Seto and art by Tomoyuki Hino.

Thanks to the efforts of Noir and Luna, the serial killer running rampant in town has finally been captured! But now a new, more personal threat is looming on the horizon. The copy of Olivia Servant that was created by the Cursed Death Chains has broken free of the Hidden Dungeon and is looking to wreak havoc on the outside world! Will Noir have what it takes to face this imposter and save his imprisoned master once and for all?! Find out in the thrilling conclusion of The Hidden Dungeon Only I Can Enter!

The final volume!