There's no guarantee that the Fed is done raising. In fact I *believe* they will raise at least 25bp longer, if not 50bp earlier this tightening cycle is finished. The BoJ, on the other hand, doesn't seem to have any reason and if they do, the long-term influence on the currency market will be but a blip on your charts. The realistic favorable for JPY at this stage appears to be news about China, such as investment controls/taxes tightening, or even a widening of this CNY trading band against USD. Any combination of these occurrences would probably see JPY gain any value as a result of risk aversion (investors scrambling to depart their JPY financed positions, similar to March 2007) as well as an increase in Japanese exports which would become more aggressive if the yuan is allowed to appreciate.