is a 1973 Japanese horror film directed by Masashi Matsumoto and produced by Toho. Based on the manga series Wolf Guy, the film's screenplay was co-written by Matsumoto with Jun Fukuda and Shirà  Ishimori. It stars Taro Shigaki as Akira Inugami, a young man who transforms into a werewolf by night. He develops a romance with a teacher while opposing a gang leader whose father, a member of the yakuza, murdered Akira's parents years before.