The Nikkei 225 slid 0.14%, or 13.45 points, to 9,633.93. The broader Topix rose 0.12%, or 0.96, to 835.25.
"It's huge fuel for Japanese exporters if the yen can maintain or continue to depreciate," said Tim Schroeders, who helps manage $1 billion in equities at Pengana Capital Ltd. in Melbourne.