As of 9:15 a.m., the 225-issue Nikkei Stock Average added 106.38 points, or 0.56 percent, from Monday to 19,149.78.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, gained 4.56 points, or 0.32 percent, at 1,410.47.
Retailers, electric power and gas, and farm and fishery issues comprised those that gained the most in the opening minutes after the morning bell.
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