KHR is, sadly, only very recently adapted, so the AMVs are few and far between. And by that, I mean nonexistent.
But then there is MAD!
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If you've ever read Reborn, and know Ouran, you might shit a brick. I sure did! G-god, I think Mukuro's supposed to be Benio. XD
CRACK > ALL. Y/MFY?