The official website for the forthcoming anime film adaptation of Mizuki Tsujimura’s fantasy novel Kagami no Kojou (English edition title: Lonely Castle in the Mirror) has posted a 45-second teaser trailer.
The novel was published by Poplar Publishing in Japan in May 2017, and its total print run has surpassed 1.2 million copies.
The film is set to be released in Japan in the winter of 2022.