After being mistaken for counterfeiters by the police, an inventor and reporter try to track down the real counterfeiters.

Umon’s services are called upon when innocent bystanders, Kayo and Minokichi, along with the ronin, Gontaro are mistakenly identified as suspects in several recent murder cases. To prove their innocence and uncover the truth, Umon launches his own investigation.

Toho comedy shot in Tohoscope featuring performances from the Peanuts and the Crazy Cats. Original released alongside another Toho comedy, King Kong vs. Godzilla.