Hey,
you,
people don't always need reasons for learning a new language. Learning for the hell is it is fine and if you can't accept that then I feel really bad for you.
Typically, when you read about somebody wanting to learn only about Japanese when they aren't even planning on interacting with native speakers, it's not really much of a reason. I'm not saying it's bad to learn for the fun of it, I'm just asking. Although, I was kinda rude in the way I asked, that's just me.