You know, I'm still not sure whether KFC's position as Japan's staple Christmas family food is due to the lack of turkey here, some cultural misunderstanding whereby someone thought that the Colonel and Santa Claus were the same person, or if it's a massive hoodwinking being perpetrated on the people of Japan by KFC. Whatever the reason, as this chart shows:
If you want to pick up a Christmas dinner at 5pm on Christmas Eve you're shit out of luck. They've still got plenty of spaces left later in the evening though, and you could always pick it up at 1pm and slap it in the microwave later.
Just a thought.