Perhaps Naruto is on a mission in a new dimension which turns out to be the world of Kamen Rider Wizard. He stumbles upon Wizard during a fight with a powerful Phantom. Naruto, being the helpful person he is, decides to join the fight. At first, there are misunderstandings due to their different fighting styles and languages, but as they continue to fight side by side, they start to understand and respect each other.
In a more complex way, they could be brought together by a common enemy. For instance, an evil force that wants to steal the power of both chakra and the magic in the Kamen Rider world. They would then need to communicate and strategize to fight this enemy. This would involve Naruto explaining his ninja world concepts like jutsu and clans, while Kamen Rider Wizard shares his knowledge about the Phantoms and magic rings.