On Thursday rates of longer-dated JGBs plunged, following an overnight recover by their U.S. fellows, even though the market was bound to a tight range in front of a national bankers' appointment at Jackson Hole this end of the week.
The 30-year JGB yield climbed half a bp to 0.185 percent and the 20-year yield poked up half a bp to 0.085 percent.
A sell-off intended to furnish the market with additional liquidity pulled in sufficient interest on Thursday.
The bid-to-cover ratio, a measure of interest, at the so-called liquidity upgrading sell-off gained to 2.87 from 2.77 at the past deal.
The FinMin put forward 600 billion yen ($5.64 billion) of Japanese government bonds with outstanding maturities of five to 15.5 years at Thursday's sell-off.