Narugon Ball Zhippuden is a sequel to the original Narugon Ball. Here is where the story of the fused reality gets into high gear and the true villains reveal themselves. This is where the story earns more of Dragonball Z's over-the-top combat and more of Naruto Shippuden's mystical story.
Much like the original Narugon Ball, this series is a clear fusion of Naruto and Dragonball. But here, we don't see the individual series first, we only see the fused dimension.