As of 9:15 a.m., the 225-issue Nikkei Stock Average added 339.93 points, or 1.18 percent, from Friday to 29,119.12.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, gained 22.96 points, or 1.21 percent, at 1,913.91.
Iron and steel, mining, and farm and fishery-oriented issues comprised those that advanced the most in the opening minutes after the morning bell.
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