Whew. The official Doki Doki Majo Saiban website has been updated, and it looks like SNK's troubling game isn't as troubling as it ... could be. CERO, Japan's equivalent to the ESRB, rated its content a C, which means it is appropriate for ages 15 and up. At least we know it's definitely not full-on pornography, and that following the development of this game is somewhat less like watching a train wreck in slow motion than it was when we thought it was going to get a Z rating (18 and up).
The website also corroborates our idea of the story and gameplay; the player, as a high-school boy, is compelled by an "angel" called Lulu to hunt witches by staring and prodding at girls to make their hearts beat quickly; their facial expressions and the background indicate their level of tension.