[Nyororin]

Don`t even consider citizenship yet.
You aren`t even in Japan as a tourist, let alone in the position to say you want citizenship.

Take a look at some of the other threads. It isn`t as simple as just moving. You will need to have income, which means you`ll need a job - to get a job you`ll need a visa - to get a visa you`ll need a guarantee from a company. To get that guarantee, you`ll have to have a 4 year degree.

You only have a 2. You may say you`ll have a 4 before applying for residency - but in the end, for anything more than 3 months of tourism you will need that degree to be in Japan.

As for a house with a yard - where in Japan? If you mean in Tokyo, forget it and keep on dreaming. How big of a yard? Little gardens aren`t scarce, but big chunks of land are. What is your budget? etc...