Because Naruto and Zuo were still genin, they needed to participate in the first chunin exam after World War IV to be promoted to Hokage. However, because they generally said they couldn't beat them, the candidates were changed to children from the parallel world. Note: The child does not necessarily have to be a child, such as technology adoption, cloning, chakra materialization, etc. The main world is where everyone survives after the war. The conditions in the parallel world are different and contain a lot of private equipment. The essence is that children are fighting and talking about their parents' feelings - there is zero sense of love, and I don't understand why. The main CP is Narasa Hashira Madui's Kamui Team. The existence of reverse demolition [note] is nonsense throughout the whole process. Just be happy with it.
Purpose: Fans realize their dreams