The 225-issue Nikkei Stock Average gained 201.12 points, or 0.95 percent, from Friday to close the day at 21,344.08.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, added 15.00 points, or 0.99 percent, to finish at 1,525.87.
Service, farm and fishery, and retail issues comprised those that gained the most by the close of play.
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