As of 9:15 a.m., the 225-issue Nikkei Stock Average gained 257.76 points, or 1.24 percent, from Monday to 20,999.41.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, added 15.22 points, or 1.01 percent, at 1,517.42.
Air transportation, marine transportation and real estate-oriented issues comprised those that gained the most in the opening minutes after the morning bell.
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