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
On that day, the huge dragon that appeared over Tokyo was the beginning of the collapse of the nation of Japan.

The appearance of monsters called beasts and the "great murder" that took place all over the world killed the Japanese, and the whole of Japan became a lawless zone occupied by the armed forces and criminal organizations of each country.

Yahiro is one of the few Japanese survivors. Having acquired an immortal body by being bathed in the blood of a dragon, he spends his lonely days as a "collector" who carries works of art from the uninhabited ruins of Tokyo.

It was the twin girls Juli and Rose who called themselves art dealers who visited such Yahiro. The two asked Yahiro to recover the mysterious existence "Kusinada", who has the ability to follow the beast.

The story of a new dragon and dragon killing, spun by a boy and a girl who met in the ruined city, opens dignifiedly!