It's been a slow grind lower for the pair since the Asian open
As the Nkkei dribbled lower so did USDJPY from 122.70
Now it's chewed through bids at 122.50 to post 122.40
Notable that GBPUSD also looking a little soft at 1.5080 with EURGBP probably enjoying some month-end love at 0.7040
GBPJPY therefore also on session lows at 184.54 and that could be another driver after yesterday's fall and rebound
Ryan yesterday had a sell-GBPJPY client recco from Morgan Stanley here
Chinese equity markets currently down around 6% also putting a squeeze on Nikkei futures