Japanese Yen Futures: The Yen Shock Has Changed the TapeJapanese Yen FuturesCME_DL:6J1!satelysfx6J is the session's headline futures market after USD/JPY failed above 159.60 and extended sharply lower. The story is no longer a routine Dollar pullback: a repricing of BoJ risk, exporter selling, yen-supporting flow talk and stronger demand for JPY calls have changed the short-term regime. Where the edge is The edge is not to chase 6J after the initial impulse. It is to recognise that the failed USD/JPY breakout has left recent Dollar-yen longs exposed. If USD/JPY attempts to stabilise or rebound but cannot sustain that recovery, the same liquidation and hedging flow can reassert itself and support another leg higher in yen futures. Evidence Spot USD/JPY has reversed from the post-August intervention recovery zone after failing above 159.60. Markets are now treating a September BoJ move as a serious risk. One-month implied volatility and JPY call demand have risen, while talk of semi-official yen buying, exporter selling and Japanese portfolio shifts reinforces the change in flow. Retail has rebuilt long USD/JPY exposure into the fall, leaving residual downside stress rather than a clean position reset. Trade idea Do not chase 6J while USD/JPY is already pressing lower near 156.25. Instead, treat any failed USD/JPY rebound as an opportunity for a fresh 6J long. The first spot area to monitor on continuation is 155.20/155.00. A durable USD/JPY recovery that absorbs the yen-flow shock would require the scenario to be reassessed.