Miracle Hime Jubilee's title character, the 531st princess of the planet Keyhole, takes a joyride on a UFO. She lands on Earth, where a boy named Kiichi Masuda inadvertently pulls out the UFO's key and resets the craft—stranding Jubilee. In order to return home, Jubilee and Kiichi must recharge the key's energy in various locks on Earth.

(Source: ANN)