And there was war in heaven. Michael and his angels fought against the dragon, and the dragon and his angels fought back. But he was not strong enough, and they lost their place in heaven. The great dragon was hurled down-that ancient serpent called the devil, or Satan, who leads the whole world astray. He was hurled to the earth, and his angels with him. (Revelation 12:7-9)

Dragons? Heavens? Earth? Odd coincidence, don't you think? Of course, artistic license changed the story a tiny bit. It is awfully close.

This calls for a mind with wisdom. The seven heads are the seven hills on which the woman sits. They are also seven kings. Five have fallen, one is, the other has not yet come; but when he does come, he must remain for a little while. The beast who once was, and now is not, is an eighth king. He belongs to the seven and is going to his destruction. (Revelation 17:9-11)

This does take a lot of thinking to understand. The woman referred to is Babylon, from where all sorts of atrocities have come. For the purposes of X, this could be Tokyo. I don't know about Tokyo being on 7 hills, but the kings part still works. This part isn't as nice in terms of understanding, though. This passage is referring to the kings fighting against the heavens, but when compared to X, it makes more sense when referring to the Dragons of the Heavens who are fighting for God and humankind. In fact, they are fighting for the horrors of Tokyo. The part about the beast is easier to comprehend. He does not really exist, but he belongs to the Seven Dragons of the Earth. He could be considered an eighth. Also, the seven heads that the woman is sitting on are the seven heads of the beast. Not sure how that works, but you get the idea.