With Buy Nippon you can also bid on all auction sites (Rakuten Auction, Mbok, ...).
Note that for now only bids on Yahoo Auction are in real time. You'll need to bid a few hours before the end of the auction for all the other sites.
In order to bid on one of these two sites fill out the form below. You can also use this form to bid on Yahoo auction from an original Yahoo Auction or Mbok link.