Hollow Regalia

is a Japanese light novel series written by Gakuto Mikumo, with illustrations by Miyuu. The series began publication on June 10, 2021 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
The ruined world of Japan. The dragon-killing boy and the dragon girl meet in the ruined city of "23 Wards" as the last survivors of the Japanese. It was the beginning of a battle to kill all eight dragons and choose a new "king of the world".