As of 9:15 a.m., the 225-issue Nikkei Stock Average added 228.37 points, or 0.98 percent, from Friday to 23,639.00.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, gained 16.06 points, or 0.99 percent, at 1,633.75.
Marine transportation, rubber product and metal product-oriented issues comprised those that gained the most in the opening minutes after the morning bell.
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