In this very long and very informative video interview, co-writer Yoshiki Takahashi explains how he got involved with Cold Fish and discusses his preparation of the script, the case that apparently inspired the film, the main characters, etc. The interview is conducted by filmmaker Norman England.
In this video interview, Jake Adelstein (author of "Tokyo Vice" and the newspaper reports "Saitama Dog Lovers Serial Disappearances" and "Saitama Dog Lovers Serial Murders") discusses the case that inspired Cold Fish.