This is a Japanese suspense thriller from the 1950s. This film is directed by Nobuo Nakagawa and adapted from the original work by the famous Japanese reasoning novelist Masaishi Yokogou (masterpiece: Queen Bee, Hachi Village, etc.). It goes something like this: a ballroom received a threat letter, and a wolf man with green face and fangs appeared in the city. After killing people, he would put a moth on it. The police were fooled by the case. Is the killer human or weird? What was the purpose of his murder?