Hinata, a shy boy in the fifth grade, receives his first-ever pet when his grandfather brings him Chris, a retired police dog with excellent training and top-notch skills. There's only one problem: Whenever Chris sees a bug, they fly into a panic. Soon, however, their nose is put to the test, when during a walk, they hear police sirens blare... There's been a robbery at a nearby jewelry shop! As the police investigation stalls, Hinata and his plucky pooch stumble across a vital clue.

In English, translated from Japanese.