The 225-issue Nikkei Stock Average gained 4.48 points, or 0.02 percent, from Friday at 23,821.11.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, added 3.65 points, or 0.21 percent, to close at 1,729.42.
Pharmaceutical, precision instrument and service-linked issues comprised those that gained the most by the close of play.
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