Money should flow into Japanese government bonds, including from foreign investors. It wouldn't be surprising for the recent rise in yen interest rates, which had been ignored by the market until now, to garner attention.
Expectations of further increases in U.S. interest rates are partly encouraging investors to take money out from Asian stocks. Fund outflows have been weighing on regional currencies.
The trend will be a stronger yen through to the end of this month. Strong stocks are drawing flows of overseas money into Japanese assets.