Here is another anime I love-- Vampire Knight
I just love the first season opening song-Futatsu no Kodou to Akai Tsumi
So I found out piano sheets for this one as well! Call me crazy... but I cannot help! If you couldn't resist either, let me know, add my page and leave me your email, I will send you the PDF version. I haven't tried on my piano yet, but I would say, piano grade 6 should handle this song alright. Anyway, you won't know until you give it a try!
Here's the actual piano version sound track for you to download. you gonna love me for it :-)