Are Ayu's Lyrics Emo?

I was showing one of my friends the lyrics to (miss)understood and he goes:

"OMG! Ayumi is emo! She just puts emo words onto happy beats, she's such a weirdo!"

I just sat there, shocked. I never thought about it, but some of her songs can be a little depressing yet beautiful at the same time. I don't listen to emo music, but does anyone have an opinion on this?