The broader Topix is up 0.9 percent, while South Korea's Kospi is up 0.1 percent.
Hong Kong's Hang Seng bucked the trend and fell 0.2 percent. China's Shanghai and Shenzhen both rose 0.2 percent.
Mostly bearish day on Asian stock markets, Japan's Nikkei climbs 1.3 percent
It's a mostly bearish trading day on Asian stock markets, with Japan's Nikkei 225 index climbing 1.3 percent in early trading on Wednesday.
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