The film had been delayed to next year due to COVID-19.
The film was originally set to premiere October 30, 2020.
△新公開日決定！— 映画『さんかく窓の外側は夜』公式アカウント (@sankakumadoeiga) September 14, 2020
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映画『さんかく窓の外側は夜』
2021年1月22日（金）公開！
霊が〈祓える男〉と〈視える男〉
心霊探偵バディが、呪いの謎に挑む
常識を覆す、新感覚ミステリーエンターテインメント！！
公開決定に関する詳細はこちらhttps://t.co/E18KinMSHX pic.twitter.com/wK2YBpRpZd
TEASER TRAILER:
FIRST FLYER:
Masaki Okada is portraying Rihito Hiyakawa and Jun Shison is portraying Kosuke Mikado.
Yurina Hirate will portray Erika Hiura. Hiura looks like a normal high school girl, but has the power to inflict powerful curses on people.
Additional cast members include: Yuki Sakurai as Saeko Hanzawa, Kenichi Takita as Hiroki Hanzawa, Emi Wakui as Noriko, Makita Sports as Matsuo Hiura, Michitaka Tsutsui as Tetsuya Ishiguro, Shinya Niiro as Kazuomi Sakaki,
Yukihiro Morigaki is directing the film, and Tomoko Aizawa is writing the script.
SuBLime publishes the manga digitally, and describes the story as:
Shy bookstore clerk Kosuke Mikado has the ability to see ghosts and spirits, an ability he wishes he didn't have, since what he sees usually terrifies him. Rihito Hiyakawa, an exorcist whose supernatural powers are as strong as his social graces are weak, doesn't seem to fear anything, mortal or otherwise. When this odd couple gets together to solve the bizarre cases that come their way, their work methods may not be entirely safe for work!