It's not yet available for download, but 2PM's first Japanese song "Take Off" is the ED song for Ao No Exorcist. Here's the teaser for the MV
Honestly, I'm not a big fan of 2PM, but ever since I watched Dream High I really like them LOL because Taecyeon is um. Sexy.
Anyway, all the new season animes are slowly coming out, and it does look like a really good batch.