Lonely Castle in the Mirror

Lonely Castle in the Mirror (Japanese: かがみの孤城, Hepburn: Kagami no Kojō) is a Japanese novel written by Mizuki Tsujimura, and published by Poplar Publishing in May 2017. A manga adaptation illustrated by Tomo Taketomi was serialized in Shueisha's seinen magazine Ultra Jump from June 2019 to February 2022, with its chapters collected into five tankōbon volumes. An anime film adaptation by A-1 Pictures premiered on December 23, 2022 in Japan.