Cometo-san (1967)

A princess ( Miss Comet ) from planet Beta is sent to Earth due to her mischievous behavior so she can learn helping others and earn points so one day she can be sent back to her home planet. Despite she is a child in her planet, arriving to earth she is 18 years old. She stays with the Ishihara family, where she always get in trouble along with the two kids, since she is trying not so successfully to do good, she is still a playful girl at heart.