The Unwanted Undead Adventurer Novel Volume 12 was written by Yu Okano and illustrated by Jaian.

Now that the tumultous events in the royal capital are over with, Rentt and Lorraine can finally complete Wolf's request, and the duo prepare to return to Maalt with Grand Guildmaster Jean Seebeck in tow. Meanwhile, Rina has been training with Alize under Isaac's guidance. Despite her newfound vampiric abilities, she remains an Iron-class adventurer; surrounded by numerous talented individuals, she struggles with self-confidence. Her prescription? Adventure! As Rentt journeys to Maalt, apprehensive of the trials awaiting him, his junior in all things adventuring and vampiric faces her own trials.