As of 9:15 a.m., the 225-issue Nikkei Stock Average added 288.50 points, or 1.32 percent, from Friday to 22,087.37.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, gained 21.24 points, or 1.33 percent, at 1,616.51.
All industry categories advanced into positive territory, with marine transportation, construction, steel and iron-oriented issues comprising those that gained the most.
Markets here were closed on Monday for a national holiday.
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