Maoujou, Aki Heya Ari

is a Japanese light novel series written by Katsuhiko Niki, with illustrations by Takekaze Horibe. The series began publication on March 10, 2023 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
'''The demon king himself manages the castle of the devil!? A real estate comedy that begins in Toyosu!''' During the final battle between the Demon King and the Hero, the warped space-time caused by the clash of secrets engulfed both of them in the Demon King's Castle――he was sent far away, right in the middle of Toyosu, modern Tokyo! The Demon King and the Hero trying to return to their original world. However, in Toyosu, where there is no magical power in the air, even moving to the next town is not possible. Angered by the appearance of a mysterious building, the demon king is forced to remove it immediately by the landlord's grandson, Yua. …. "All the people who live in this apartment! "Why is the rent not paid!!" "The residents gathered at this dubious property are all crazy people who have even the devil's head on their head!" A real-estate comedy in which the demon king (?) struggles to enrich the lives of the residents opens in Toyosu!