The 225-issue Nikkei Stock Average added 199.50 points, or 0.95 percent, from Wednesday to 21,299.56.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, gained 13.89 points, or 0.92 percent, to 1,516.39.
Electric power and gas, pharmaceutical and miscellaneous product-linked issues comprised those that gained the most by the morning break.
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