Madou King Granzort

In the future, the moon is a habitable place with an atmosphere and gravity, hosting a famous tourist attraction. There are also rumors about log earred, rabbit like creatures on the moon who can use magic. Haruka Daichi heads off to the moon during a summer holiday alone because he wants to see the long earred creatures himself.

However, he get himself dragged into an millenia-old conflict between two ancient moon races: the "long ears" race and the Jado race. The Jado race wants to conquer the universe and resurrect certain evil powers to seize control of the Earth. Now the "long ears" race and Daichi must seek three warriors who can use magic in order to release the Mado King and the "long ears" race's kingdom, Rabiluna, from the Jado's control.

(Source: AniDB, edited)