I think Japanese keywords with dot NET is okay.
I personal got few hundred Japanese domain names, and most of them are dot NET.
For your ref. -
Quote:
canonical name にほんご.net. (xn--38j2b6b6e.net.)
Domain Name: XN--38J2B6B6E.NET
Status: ok
Updated Date: 22-mar-2007
Creation Date: 09-nov-2000
Expiration Date: 09-mar-2008
|
[ にほんご.net ] - this dot NET domain name was register on 09-nov-
2000 by a Japanese company;
then [ にほんご.com] register on 10-jul-2007
You may image How important is the dot NET in Japanese domain field.
Some IDNclub member have display their Japanese IDNs at this page -
http://idnclub.com/showthread.php?t=4087
if you interested, you may have a look...