In the year 2050, a violent earthquake on the moon spontaneously changed the moon’s atmosphere and gravity, making it habitable for humans to live upon. Fifty years later, the young Daichi Haruka heads to the moon for summer vacation; he wants to try out his newly created Jetboard, but he wants even more to catch a glimpse of the rabbit person recently spotted in the desert. After running across a little girl with furry ears and her like-bodied grandmother V-May, Daichi finds himself in the middle of a grand adventure! With the help of the giant mecha Granzort, his new companions and two other children, Daichi will help put a stop to an evil monster race that is dead set on controlling the universe!
Wataru Ikusabe was just a normal fourth grader - until he was somehow transported into another world and dubbed its savior. In this world, the evil King Doakudar has taken over Mt Soukai and caused the rainbow in the sky to turn white, and it's up to Wataru to defeat him and return the colors to the rainbow. With the help of the young Shinobu clan leader Himiko, gruff Shibaraku and the feathered spy Kuruma, Wataru will climb the mountain and bring down the forces of evil with his mecha Ryujinmaru!
Wataru and Granzort are remarkably similar as far as tone and feel; each involves a young boy who is thrust into the cockpit of a mecha and is responsible for taking down the ultimate evil. The characters' chibi-style appearances are also quite similar, as are the attitudes of the main characters. There's pretty much no chance that if you liked one, you wouldn't like the other too.