If anyone's wondering, DCC is finally being implemented in Japan. I just got hit with it a couple hours ago. Fairly easy to avoid, but I have no idea what I would've been taken for because all it prompted was 外貨決済(DCC)対象カードです はい\いいえ (Essentially "This card can do payments in foreign currency (DCC) yes/no"). Pushing "no" produced a DCC-free slip.