Tokyo stocks opened 0.78 percent higher on Wednesday as the yen continued to trend lower amid expectations for more aggressive easing steps by the Bank of Japan.
The Nikkei 225 index at the Tokyo Stock Exchange was up 71.09 points at 9,213.73 at the start.
The yen has weakened in recent days after Japan's opposition leader, who is favourite to be Japan's next prime minister following December elections, called for bolder steps by the central bank.
A strong yen hurts Japanese exporters as it erodes their income when repatriated.
The euro bought $1.2815 and 104.75 yen in early Asian trade, compared with $1.2818 and 104.70 yen in New York late Tuesday. The dollar firmed to 81.77 yen from 81.67 yen in US trade.
Shortly before the market opened, Japan's finance ministry released trade data showing the nation's deficit in October nearly doubled on year to $6.7 billion as shipments to Europe sank while a territorial spat with China also weighed.
US stocks closed near break-even Tuesday, clawing back from losses after Hewlett-Packard's huge charge for a soured acquisition and disappointing results rattled sentiment.
The Dow Jones Industrial Average shed 0.06 percent to 12,788.51.