Please note that a "visa hop" will likely flag you for questioning on subsequent trips. Bear in mind that their biggest concern is people working illegally.
A few years back, I had a 4-month trip planned. I left at day 90 and spent two weeks in Korea (visiting friends and climbing--I used to live there as well). I came back for the last two weeks of my trip without incident, but the next time I visited Japan about a year later, I was pulled aside and questioned more thoroughly about my travel history, even though i clearly wasn't doing it to "max out" my time in Japan.
@vu7, a lot of your posts have me thinking that maybe you just want to spend a lot of time in Japan, could you explain a bit more as to your plans, and why you are trying to live in Japan long-term as a tourist?