Mamoru Miyano, who voiced protagonist Kei Nagai in Ajin (2016), voices Nagai's IBM spirit in this film.
Ken'ichi Suzumura, who voiced Sokabe in Ajin (2016), plays news reporter Noriaki Iwashimizu in this film. He got the role because his younger brother Masaki is working as an assistant to director Katsuyuki Motohiro.
Based on manga series "Ajin" by Gamon Sakurai (first published July 6, 2012 in Japanese seinen manga magazine good! Afternoon).