[samurai007]

Very hard to impossible to get a visa for "just a relationship", and without a 4 year university degree, you also won't get a visa. And finding work in Japan without a degree won't be easy at all.

I don't know the immigration laws in Finland, but you may have an easier time having her move there instead of you moving to Japan, at least until you can get a 4 year degree. Or maybe both of you could move to the US, Canada, or some other country...