Hi,

What are the solution you'd recommend for the on-line fix of someone who 
will stay in Japan for just a few weeks (that may extend to a pair of 
month) ?

I was thinking of good ole dial up, preferably as hassle free as 
possible with an on-line registration and no additional charge over the 
dial up number cost itself. Found asahinet, but it sound like you do 
need to take a monthly plan (sound incredible to me in France, we've had 
monthly plan free, local communication charge only dial up access since 
1999).

But then maybe a 3G data card is a better option, the speed would 
probably be less painful, however the prices I've found for now sound 
really high : http://www.pupuru.com/en/service/emobile/

Is subscribing to ADSL offer and canceling it very fast also an option ? 
Or subscribing to a 3G data card plan and canceling it. Doing it with 
the ID of a permanent resident is not a problem.