Hollow Regalia Novel Volume 5 was written by Gakuto Mikumo with illustrations by Miyuu.

Yahiro and Iroha finally arrive in Kyoto, only to find the head of Galerie Berith waiting for them. The man has conspired to take the Relict Regalia from Karura Myoujiin, and prepares to invade the Imperial compound. To rescue Karura, Yahiro and Iroha infiltrate the compound, and in the process come to know the truth about the dragon mediums and the reality of their world. At the same time, Sui Narusawa finally opens her eyes.