The goth/darkwave scene in Japan is just barely starting.
Around Osaka, there are some gothic clothing shops(Doberman and Alice Auaa) and Territory Records, which is owned by Taiki, who pretty much started the whole gothic club scene in Osaka, has a dark ambient band of his own(Diabolic Art), and is one hell of a nice guy!!
He used to have a goth bar around here called Sabbat, but that has since closed, so now he has a gothic club event about once a month or so in various locations.....
As for actual bands though, the only Japanese darkwave band I can think of is Eve of Destiny from Tokyo, who play sort of an electro-gothic-EBM sound.
I guess the emergence of goth here is a logical evolution, since Japan has been into punk for so long......
the punk scene here is huge; the metal scene here has been around forever, but the bands are varied and scattered; there used to be a noise scene in the 80s(Merzbow, etc.); and there`s a booming electro-trance scene. But goth is just getting started, and I`m interested in what direction it might take.
As for links:
Taiki`s shop Territory Records, club events, and Diabolic Art:
http://www.territory-d.com/
Alice Auaa, the high society, ubergothic designer clothing shop(nice people despite being ubergoths, but a bit pricy):
http://www.alice-auaa.co.jp/
Eve of Destiny`s site:
http://www.eveofdestiny.net/