Ten-year JGB futures gained 0.20 point to 151.21, its highest level since September 2017, with a trading volume of 42,404 lots, as the yield on U.S. 10-year Treasury notes fell to a 10-week low of 3.013 percent in late Asian trading hours.

The benchmark 10-year cash JGB yield fell 1.5 point to a four-month low of 0.080 percent.

The super-long sector followed suit, with the 20-year, the 30-year and the 40-year yields falling between one and two basis points each to 0.590 percent, 0.810 percent and 0.965 percent, respectively.

On Wednesday, U.S. Federal Reserve Chair Jerome Powell delivered a speech in which he signaled that an end to the bank's interest-rate hike cycle may be closer than previously suggested.

The market was also supported by Thursday's auction of two-year debt, which proceeded smoothly and attracted modest demand from both foreign and some domestic buyers.

The two-year notes were sold at the lowest price of 100.465, marginally higher than market expectations of about 100.46, and the auction drew bids 4.66 times the amount offered.