Demand for Japanese government bonds is extremely weak:

The bid-to-cover ratio for 10-year bonds, a measure of the demand strength, fell to 3.02 at Tuesday’s auction, below last month’s 3.30 and the 12-month average of 3.24.
This reflects rising reluctance among investors before a snap national election on Sunday, February 8th.
A victory for Japan’s ruling bloc would allow Prime Minister Sanae Takaichi to push further fiscal stimulus plans, which could significantly raise the government’s debt burden.
As a result, the 10Y bond yield is up to 2.26%, near the highest level since 1999.
Meanwhile, on Thursday, another key auction of 30-year bonds is scheduled, which will be closely watched by investors.
The Japanese bond is under serious pressure.