Didn't Ayu say that Ayu writes about Freedom and Love during I am..?. Allthough I'm not sure which word she used in japanese for "love" and what it truly encompasses, there are so many facets to the notion of "love" and so many potential situations where it plays an essential role, it's hardly a limiting subject to choose. ;-) Her topics changed a lot through out her career as well, it wasen't untill I am .. she started to take on bigger subjectst that deal with society as a whole, she went from "me" to "we". After RAINBOW, it's been more of a mix hasen't it and much more about the traditional love song kind of lyrics hasen't it?
Freedom in the right hand, Love in the left
We'll walk on, embracing both, and stumbling from time to time.