Japanese government bonds rose in early Tokyo trading after most U.S. Treasurys gained overnight and the yen strengthened. The 30-year JGB yield fell 7 basis points to 4.095%. Investors are focusing on the Japanese Finance Ministry's planned auction of about 600 billion yen of 30-year bonds. Citi Research's Tomohisa Fujiki said near-term volatility cannot be ruled out, but yields in the superlong sector appear sufficiently high and pension-fund demand should help the auction proceed smoothly.