Hollow Regalia (Japanese: 虚ろなるレガリア, Hepburn: Utsuronaru Regaria) is a Japanese light novel series written by Gakuto Mikumo and illustrated by Miyū. It began publication under ASCII Media Works' Dengeki Bunko imprint in June 2021; as of February 2024, six volumes have been released. A manga adaptation, illustrated by Matsuki Ugatsu, was serialized in Dengeki Maoh from September 2022 to August 2024, with its individual chapters collected into four volumes. Source: Wikipedia (en)