Both the Nikkei 225 index and the broader TOPIX climbed 1.2 percent in early trading on Wednesday.
Stock exchanges in China, South Korea, and Hong Kong are closed for the New Year holiday.
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Many Asian stock markets remain closed on Wednesday for the weekend. Tokyo, however, is open and showing gains.
Both the Nikkei 225 index and the broader TOPIX climbed 1.2 percent in early trading on Wednesday.
Stock exchanges in China, South Korea, and Hong Kong are closed for the New Year holiday.