This correlation is common during normal markets. When the USD is getting sold, it suggests risk appetite is up, therefore, eur/usd goes up, usd/jpy goes up and all the other cross/jpy's go up as well. Interesting correlation. I guess it's a product of the masses, meaning everyone buys cross/jpy which substantially devalues the yen which in turn drives up usd/jpy even though the USD is getting sold across the board. When these correlations come into play, it suggests that the market is returning to normal flows.