Just having a look at the USD/JPYon a weekly chart i have noticed that we seem to have broken a trend-line that has been in place since mid 2008 which is a pretty positive sign. A number of the technical studies looking a little overbought and the 50 Week MA coming in at 100.10/20 are the only negatives that i can see.
Look to buy the break of 100.00 and you should be able to lob them back out somewhere above 104.00 in a couple of days time.