Due to the Covid-19 outbreak, the movie's release date of October 30, 2020 was postponed to January 22, 2021.
Based on manga series "Sankaku Mado no Sotogawa wa Yoru" by Tomoko Yamashita (first published April, 2013 in Monthly Magazine BE×BOY).
Movie's theme song is "Kuraku Kuroku" by rock group Zutto Mayonaka de Iinoni.