Personally, I am not accustomed to no facial expression in performing arts. You are right. That's Tommy style & her unique voice which made the song to the top in J-POP record in 1998. Thanks to her ^_^ !!
Most Japanese I knew, really conserve themselves very keen. Come on! Show your passion and sincere toward the world.. The girl is so naive , a bit strange to match with lyrics,,, ごめんなさいね、