Tokyo's main Nikkei index closed higher on Friday as the dollar's rebound encouraged buying, but the broader Topix was down, with little fresh news to guide investors.
The benchmark Nikkei 225 index rose 0.73 percent or 159.18 points to end at 21,870.56. Over the week, it rose 0.28 percent. The broader Topix index was down 0.07 percent or 1.12 points at 1,605.40, falling 1.25 percent since last Friday's close.
The market was "supported by a weaker yen," Okasan Online Securities said in a note, adding that rising Fast Retailing shares also boosted the main index.
Among major shares, Uniqlo-operator Fast Retailing surged 7.89 percent to 59,880 yen after releasing a robust six-month earnings report Thursday that showed brisk international sales.
Struggling engineering firm Toshiba dropped 2.71 percent to 3,585 yen after it announced that Chinese chemicals maker ENN Ecological Holdings had decided not to buy the Japanese firm's liquefied natural gas operations in the United States.
The decision deals a serious blow to Toshiba, which is going through painful and sweeping reforms to stay afloat after logging billions of dollars in losses from its disastrous acquisition of US nuclear firm Westinghouse.
Panasonic jumped 2.75 percent to 1,015 yen following a report that the firm was suspending plans with US electric vehicle maker Tesla to expand a battery plant in Nevada due to weak demand for the vehicles.
The firms froze a plan to boost capacity of the Gigafactory 1 battery factory "as concerns mount on Wall Street about weakening demand at Elon Musk's car company," Nikkei Asian Review reported.