Ryotsu Kankichi, or Ryo-san for short, is an unconventional cop working at the local police station who loves money. Together with famous celebrities like Nakagawa and Reiko, his strict boss Police Chief Ohara, and other wildly unique characters, he gets everyone caught up in all sorts of hijinks!

The movie starts off with Ryotsu (with Honda as his patsy) hatching another crackpot scam with a fake UFO sighting (via fake crop circles and a wire-hanging UFO). But the plan fails per usual, with the Kameari Park Police Box which results in Ohara punishes Ryotsu by subtracting him from the station's group vacation to Hawaii the following day.

Kankichi Ryotsu is sulking after his bonus was snatched away by the members of the shopping district. On TV, they hear that Princess Sabrina of the Attakaino Kingdom is coming to Japan. While making a delivery, Ryotsu encounters a kidnapping incident. The girl he rescues from the kidnapper is Princess Sabrina! The kidnapping case develops into a major commotion that involves the downtown area! Will Ryotsu be able to protect the downtown area and everyone there?