Searching for an Anime

I have been trying to find of the name of this anime that i want to rewatch but i cant seem to remember the name or name of any of the character. Its about this girl and she seeks if i remember correctly "Oparts" it think (its Not O-Parts Hunter) and she finds this vampire and awakens him with her blood, she has this two other companions a girl and a boy who seem to go back from child to adults and they are fire and water elements. The main girl used this crystal thing to unlock oparts but they all end up being a fake and something comedic and bad happens. Please if you know what I'm talking about tell what the name of the Anime is! thanks in advance:D

BLOOD +??

no its not Blood + i know that anime. Its more comedic if i remember correctly

Random guess, Vampire Knight?

I just checked Vampire Knight and its not the one:|

Perhaps you can post more information about it?
Maybe more about the storyline, etc. etc.

all i can remember is that the main girl is in search for the one true "opart"(not sure if thats what its really called but thats what i remember) and each episode revolves around her, the vampire and the elemental twins and their search for it. she finds one each time and uses this crystal key thing and inserts in the opart and since their all fake something bad happens. she does eventually find the true opart but i cant remember anything else. I hope this info helps.
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Please If anyone knows what i'm talking about please help me:|

Seriously? No one knows:| :(((((

Dude, Elru. How can you not put Death Note in your list. That has got to be my favoyrite of all. Great plot, entertwining twists, and when Light (main protaganist) gets his Death Note back after dismissing it for ever and denying he killed loads of people, then getting it back with the epic music score in the background while Light describes what he planned all along to the viewer is not short of being amazing. Lol. Thats just my opinion however.EDIT: I posted this in the wrong thread. My bad. How do I delete?

666 Satan..................maybe

Replying to #10

666 Satan IS O-Part Hunter
And I don't really remember vampires in 666 Satan

Is this the one?
http://en.wikipedia.org/wiki/Master_Mosquiton_%2799

Replying to #12

OMG! yessssssssssssss!!!!!!!! this is the one! OMG THANK YOU!!!!!!!!!!!! I love you so much thank you! :*