Chokin Senshi Cashman

A policeman from Biretijon, Jiora, crash-lands on Earth while chasing criminals in space. After fixing his ship, he finds himself lacking fuel and assumes the identity of a man he accidentally killed upon arrival, Chapat, a local police officer from Slope Town. To gather the 17 million yen required to purchase fuel, which his ship accepts as gold, Jiora continues his crime-fighting efforts on Earth while maintaining his alien form, known as Cashman.