In a Naruto Hado 90 fanfiction, Naruto might find himself in a parallel universe where the ninja world is based on different energy systems, and Hado 90 is part of that system. He has to figure out how to use it while also dealing with the different politics and power struggles in this new world. For example, there could be a powerful clan that wants to monopolize the use of Hado 90, and Naruto has to stop them to protect the innocent. This would involve him making allies, learning the secrets of this new world, and of course, mastering Hado 90.