Jigoku666 requested the PV for Kiseki by the Japanese group GReeeeN earlier this week.
I read a little about the group on Wikipedia and it says that they never show their faces in public so that they can keep working as (or studying to be) dentists
GReeeeN ~ Kiseki for PSP
42MB 6:32 H.264/AVC 480×272
Credit: source video from TechLogic@jpopsuki