Lol DDR is taht popular in Japan huh? when I went, I saw Taiko drumming games all over, so I would guess that is just like DDR for them.
BTW, Taiko on hardest mode = OMG ARMS HURT. both me and a friend only got 50% hits, with both of us hitting the smae drum, lol. Sore arm for he next two nights ouch!