Guest post by "KFox" My least favourite is chapter 4. I still like it, but up until then, MotA was much more action-orientated, and was so for the other two chapters. I felt it broke the flow of the story.
My favourite is a toss-up between chapters 1, 5, and 6. I really like buff guys like William and Eke, so any chapter which features them prominently will rank high for me. Story-wise, chapter 1 gets everything rolling and is easy to understand, chapter 5 shows just how much the keys work as a team and form a strong bond, and 6 focuses a lot more on the relationships between the keys and their friends.