The USDJPY is getting close to a zone where you have to stay alert. There is a good potential in the 4 hours chart that the price break out the resistance and continue the bullish rally. Nevertheless, in lower charts the USDJPY is going to have a very dificult way for breaking out the resistance.
So, the idea is to stay alert for a break out and confirmation of it to go long, or a retracement in the price in the 4 hours chart to go short.