User blog comment:SpookyBoogie27/Light Novel Spoilers/@comment-6420907-20130211045204/@comment-1359322-20130218023223

@Sbrzzi that is like saying that it is weird that Matsuda and Motohama are Humans, i understand that how people like to keep their dreams but in this case i would say its quite impossible,there are too many factors that would have revealed her identity, the number of powerful people roaming the Kuoh Academy + the special barrier in Issei's town. And after the event in Volume 11 & 12, i think they would be stricter with those related to mythology and would have told the Young Devils the identity of Kiriryuu.

P.s. the one that originally thought of this is because of an illustration of Kiriryuu in Volume 14. The illustration is actually made for the upcoming season 2.