"you intend to become president yourself? Yet you're the same as the Kiryu twins...a sinner since birth...one of the filthy beings.who are called vampires without fangs." (from my copy of volume 10)
I think this is a huge clue. Hino sensei is trying to tell us that kaien cross was suppose to be a twin! also im wondering anything we what other information about headmaster's past life sliped us by.
Tell me what you think guys if you have any ideas I would love to hear them(or rather see them.)