Bernard is a cheerful 9-year-old orphan who lives with a man named Diego. After finding out that Diego is none other that his hero Zorro, Bernard in turn becomes "Little Zorro", Zorro’s assistant. Lolita, Diego's pretty, sweet-tempered 17-year-old girlfriend, wishes he weren't so easygoing, and more like Zorro, whom she worships; but for her own safety, Diego keeps his secret identity from her. Also joining the fray are Sergeant Garcia, someone who enjoys food as his girth would suggest; Figaro, Little Zorro’s adventurous pet puppy who always dons a funny mask; Tornado, Zorro’s noble white horse; and Tackle, a lazybones pooch. Can Diego fight to defend the people from the nobility's cruelty while still keeping his identity a secret?
Long ago, Robin lived with his family in the Huntington’s castle; that is, until one day the cruel Baron Alwine set fire to it, leaving only Robin and his cousins as the sole survivors. After escaping to Sherwood Forest, the group were taken under the wing of the hermit Friar Tuck and taught to survive in the harshest of conditions; but they are not alone in the forest! Little John and his gang of bandits are afoot, and they’ve kidnapped the beautiful Maid Marian! After discovering that they all share the same enemy -- Baron Alwine -- the entire gang (Marian included) decide to combine their forces for the greater good. Now, against tyranny and to protect the weak, Robin and friends will raise their swords and bows for justice!
There are many similarities between Kaiketsu Zorro and Robin Hood no Daibouken. They both focus on a noble hero fighting for justice with the help of the woman they love (and it's refreshing to see these women strong and fighting instead of weak).