Investors are currently willing to lend to the Japanese government across all time horizons for almost no return. This has been the case for some time for short-term funds (i.e. the front end of the yield curve) but we are now seeing close to zero yields on Japanese Government Bonds (JGBs) with a 30-year maturity. There will be a rationale behind this but that doesn't stop it being a pretty worrying sign that things are seriously amiss in the capital markets.
(chart via FT's twitter)