Connections are everything.
Coming to Japan to look for work without any contacts is a pretty stiff order for anyone, even more so in a particular industry like art or design. I'd recommend trying to make contacts with people who work in the field in which you are interested... seeking them out online and/or visiting can help here. Find artists you admire and reach out to them. Even more importantly, focus on your studies and build a stellar portfolio, the kind that people see and WANT to befriend you because they think YOU'D be a good contact.
Interning or doing a semester abroad at an art school in Japan would go a LONG way towards building those connections, making you local friends, and also give you some experience staying in the country which could feed/squelch your desire to live there in the future.