Itsuka Tenma no Kuro Usagi

When Taito Kurogane was little he met Himea Saito, a vampire girl who gave him a curse of living after dying, but dies after being killed the 7th time. Himea was then taken away from Taito, who loses all memory of her. After 9 years, Taito is now in high school, and has freed Himea, and they begin to catch up on the 9 years away from each other.

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Taito has been really sleepy lately, and keeps dreaming of a female vampire who says she has given him her “poison.” Sometimes he even thinks he hears her voice when he’s awake. But after surviving an accident that should have killed him, Taito’s world changes drastically and he realizes that his dreams are more real than he thought.