The main character is an artificially created half-wolf, half-human Hiroshi Inaba, formerly a police officer and now a private detective who solves crimes by studying and tasting human hair. Usually Hiroshi looks like a man, but he can also take on a more wolf-like form, and his abilities in that state depend on the color of hair he has recently tasted. Hiroshi"s main enemy is Don Valentino, a criminal genius and … goat who feeds on money. Most of the manga chapters describe various unsuccessful attempts by Hiroshi and his companions—the sadist-transvestite-secretary Yuta, the "ordinary teenager" Kei, and police officer Ogino—to catch Don.