As of 9:15 a.m., the 225-issue Nikkei Stock Average added 219.39 points, or 0.80 percent, from Thursday to 27,709.52.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, rose 3.49 points, or 0.19 percent, at 1,829.79.
Rubber product, pulp and paper and mining-linked issues comprised those that gained the most in the opening minutes after the morning bell.
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