Hi,
I just bought your tool, thinking I could DL what I bought from their Japanese storefront.
...Until I encountered error upon using "--server=dmm" option and eventually found this topic.
It would be very cool if you could implement this feature soon; I reside in Japan and have my own DMM acount for 5+ years oh and also Japanese is my native language so I think I can provide help if necessary.
Massive respect for creating and sharing this wonderful piece of software. Cheers!