Death March to the Parallel World Rhapsody Novel Volume 12 is written by Hiro Ainana with illustrations by Shri.

With the demonic threat taken care of, relative peace has returned to the Labyrinth City, allowing the residents to return all focus to the Labyrinth itself. But when the deeper levels of the Labyrinth prove to be more of a challenge than anyone realized, Satou decides it's time for some special training with the Elves!