Kouchuu Ouja Mushiking: Zack no Bousen-hen

Legend has it that on the top of the tree on an island, there is a king insect - the most powerful insect in the world. But only those who can climb to the top of the tree are worthy of it. Zack - the guy who specializes in hunting for snakes also sets out to find the Heavenly Tree with the desire to become the King of Insects. But he could not have imagined that he would have to face fierce battles before with his new companion - the armor Kabutomaru.