[Hatredcopter]

I've heard second-hand reports about people being turned away after multiple visa runs to Korea - it seems it has more to do with the particular immigration officer they run into rather than any certain rules or regulations - but then again, I can't verify any of those reports.

If you're trying to make a living in Japan, keep in mind that it's a lot harder to do certain things on a tourist visa, i.e. opening bank accounts or getting a mobile phone or getting any long-term accommodation. I would strongly advise against visa runs if you're trying to stay in Japan long-term.