As of 9:15 a.m., the 225-issue Nikkei Stock Average added 81.23 points, or 0.36 percent, from Friday to 22,881.04.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, gained 2.82 points, or 0.17 percent, at 1,651.26.
Marine transportation, rubber product and nonferrous metal-linked issues comprised those that gained the most in the opening minutes after the morning bell.
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