Hello Everyone....
Satoshi, 7m3tjz, has provided a list of Japanese D-Star repeater systems on his website. Here is the link to the document:
http://d-star.dyndns.org/misc/Japan_repeater_0725.pdfRemember, when calling a D-Star station in Japan, callsign specific routing will not work, so you will be unable to return the call using the "one touch reply" feature on your radio. Zone calls only!