As of 9:15 a.m., the 225-issue Nikkei Stock Average added 31.66 points, or 0.14 percent, from Friday to 22,524.34.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, gained 5.83 points, or 0.36 percent, at 1,627.82.
Pulp and paper, construction and nonferrous metal issues comprised issues that gained the most in the opening minutes after the morning bell.
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