Naruto's life was good. Yeah, he was in another world, but when had he ever he let a small think like that stop him from enjoying life? Plus, this world was kind of fun, and it had a number of benefits. Two in particular.
Blood is thicker than water. This saying is especially true when it is Uzumaki blood. The Uzumaki family might seem insignificant in a world filled with dragons, gods, and other supernatural beings, but their bonds give them a unique strength. How will the world fare when faced with Uzumaki fighting to preserve their bonds by any means necessary?
Ending up in a new world by accident, Naruto's mere presence has shifted the flow of events. So Naruto is sent to Kuoh Academy to ensure peace will eventually be reached in this new world. Can he ensure peace in a second world? He'll sure as hell try, dattebayo!