As of 9:15 a.m., the 225-issue Nikkei Stock Average gained 168.10 points, or 0.78 percent, from Thursday to 21,720.08.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, added 9.02 points, or 0.57 percent, at 1,590.44.
Marine transportation, mining and securities house-linked issues comprised those that advanced the most in the opening minutes after the morning bell.
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