They've done a good job with this series. It did feel a bit uncoordinated at times, but this is a four episode OAV and it's often very hard to avoid such things happening; there is simply not enough time.
Kazuna is a young man with a fairly normal life. He attends high school, lives with his surrogate family, and models for his somber love-interest Yaegashi's paintings. But recently, he has suffered several crippling attacks at the sight of blood -- attacks which leave him incapacitated and out of control. Kazuna must now reunite with his sister who he has not seen in years, and discover the truth behind his family name and vampiric genes, before his bloodthirsty desires destroy himself, or others close to him.
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so it sets the right mood then? XD