Voltage differences Europe vs Japan


I am facing the possibility of moving from France to Japan for a few years and of course wish to take my beloved hi-fi system with me.
I understand that Japan (or at least Tokyo) has 100v mains vs the 230 here in Europe. I also believe that domestic mains wiring to sockets does not have any earth connection ?.
Can anybody please provide any guidance on where to source a quality transformer (or other option) and what happens ref the earth given that all of my components are earthed through their respective mains leads.
System is Emm Labs DCC2 & CDSD, ATC Active 50's, Mac Mini.
Many thanks in advance for any kind support & advice.
gsm
My thanks to you all, I really appreciate this forum and the help, if I can ever reciprocate for audio matters in France - don't hesitate. Certainly the step up transformer route looks logical. Can anyone shed any light on how to adapt to the lack of earth wiring in the domestic Japanese outlets, currently all of my apparatus is earthed through the mains leads ?
To T_Bone, thank you for the welcome, when I eventually arrive if you feel like auditioning Emm Labs and ATC over a glass or three then you shall be very welcome.
Gsm, It would be my pleasure and privilege.
Regarding your ground, there are a couple of products which are sold which provide a ground. The best-known version is the Acoustic Revive RGC-24, and I believe Acoustic Revive made one other, which can be found used. They are available at or through Tokyo high end stores or on Yahoo Auctions (the local version of ebay). The other easy way to accomplish this is to ask the realtor/landlord to get an electrician to put a ground in, and run it pipe to where you want to use it. It does not cost much, and if asked for as an initial condition for rental, it will probably be done for you. Note that the Japanese word for 'ground' is 'earth' (アース), pronounced the way a posh old man might state (slowly), "He forgot [to get a ground installed] - what a Stupid A__".