USD/JPY has just taken out its highs from earlier this month and is getting awfully close to May 2013 highs now. There were good offers around but the persistent buying is soaking them up. A late in the US day move like this is often a sign to continuation. Liquidity will remain thin until Tokyo gets more active, and good-size offers lie ahead of 103.50 still:

usdyen chart 13 December 2013

Meanwhile, EUR/JPY is making new highs for 2013:

euryen candlestick daily chart ytd 13 December 2013