It seems Nakayama Toge ski resort(near Sapporo, Hokkaido) has opened. A lot of ski resorts in Hokkaido are planning to open this weekend. Edit: This video was filmed yesterday. It's close to Sapporo and the other ski resorts nearby haven't opened yet, so it was crowded.
I read about that resort... it has one double chair and is only open until mid december this year.
It then re-opens for spring skiing next april