The official website for anime movies Lonely Castle in the Mirror has revealed that two new voice cast member has been added to production. japanese comedian Shingo Fujimori will voice homeroom teacher Kokoro Ita-sensei while YouTuber Karen Takizawa will voice the Kokoro Middle School nurse. The film is scheduled to premiere in Japan on December 23, 2022.
Fujimori and Takizawa join the voice cast consisting of Ami Touma as Kokoro, Takumi Kitamura as Rion, Sakura Kiryuu as Aki, Rihito Itagaki as Subaru, Naho Yokomizu as Fuka, Minami Takahashi as Masamune, Yuuki Kaji as Ureshino, Kumiko Asou as protagonist Kokoro’s mother, and Aoi Miyazaki as Kitajima-sensei.
Film production staff including Keiichi Hara (Birthday Wonderland, Miss Hokusai) as director, Miho Maru (Birthday Wonderland) as a screenwriter and screenwriter, Keigo Sasaki (Detective Millionaire Balance: Unlimited) as character designer and chief animation director, Ilya Kuvshinov (Ghost in Shell: SAC_2045 character designer) as a visual concept artist and lonely castle designer, and Harumi Fuuki (Deer King) as a music composer. Figure A-1 handle animation production.
Lonely Castle in the Mirror based on author Mizuki TsujimuraNovels 2017 from Poplar Publishing. It was later translated into English by Philip Gabriel and released in 2021. Doubleday and Penguin Random House released the novel in English.
A manga adaptation of the novel by Tomo Taketomi was serialized in Shueisha’s Ultra Jump magazine from June 19, 2019 to February 19, 2022. It is published under the Young Jump Comics imprint and has released a total of five tankoubon volumes.

Penguin Random House depicts the original Lonely Castle in the Mirror novels as:
In a quiet Tokyo neighborhood, seven teenagers wake up to find their bedroom mirror shining.
With one touch, they are pulled from their lonely lives into a stunning castle filled with winding staircases, wary portraits and twinkling chandeliers. In this new sanctuary, they are faced with a series of clues that lead to a hidden room where one of them will be granted a wish. But there was a problem: if they didn’t leave by five o’clock, they would die.
As time passes, a devastating truth emerges: only those who dare to share their stories will be punished.
Source: Lonely Castle in the Mirror Official Site