Nice!

This is a lovely peaceful take on the opening. Don't know about hip hop though :P That isn't a bad thing though. I could fall asleep to this, definitely liking it.

i thought

it was about to start rapping the words

Pure awesome.

Love the piano work, maybe you can make more remixes of famous animes?

some ideas.

well i can give u ideas.u see.if u want to add with hiphop then add both piano and drums or whatever

hmmm...

I would say, well done on the composition. It has a very good feel to it. But it is not what i would call hiphop dude. It has a drum beat at 4:4, which would make it hiphop drums, that's about it. Otherwise i suggest placing this in trance or slow rock category. maybe even classical. Well done anyway tho.
Keep it real.
XT.