@horn goat: she's the hot, new thing right now, just like Anaru from AnoHana was, just like Sena from BokuTomo was, just like Miyuki from Mahouka was not too long ago. give it time once the summer season and especially c88 come around there'll be a new girl who's on every other doujin....
Dunno about Anaru or Mahouka's Miyuki, though Sena was a trend. All a matter of design, and Hestia's stands out nicely (surprised no one tried to put Sena in that outfit)