The Nikkei 225 index rose 0.40 percent, or 90.64 points, to 22,529.29, but the broader Topix index was flat -- up 0.01 point -- at 1,557.24.
A Japanese billionaire who launched a public search for a girlfriend willing to join him on a trip into space abruptly cancelled the hunt on Thursday, despite attracting nearly 30,000 applicants.
The Olympics have never been cancelled outside of the world wars, but Japanese officials have been clear that they have no intention of postponing the Games again beyond next year.
The Nikkei 225 lost 0.56 percent, or 126.45 points, to end at 22,455.76, while the broader Topix index fell 0.40 percent, or 6.36 points, to 1,587.09.
Koji Ishii can't help himself: whenever he sees a lost glove on the streets of his hometown Tokyo, he just has to stop and document it.
It is a scene repeated the world over: pedestrians glued to their phones while walking, causing collisions and sometimes accidents. No more, says one Japanese city.
The benchmark Nikkei share average retreated from early slight gains and finished 0.18% lower at 22,437.27, with 72 advancers against 147 decliners.
The benchmark Nikkei 225 index rose 0.73 per cent, or 166.74 points, to 22,884.22 while the broader Topix index was up 0.36 per cent, or 5.71 points, at 1,582.74.
The key Nikkei 225 index fell 0.58 per cent, or 132.61 points, to end at 22,751.61 while the broader Topix index lost 0.62 per cent, or 9.78 points, to 1,572.96.