whats this anime with these descriptions?

ALESANA

New member
its about vampires and doctors and angels
main guy wears a black trenchcoat and he has memory loss
evil guy has white hair and white coat

there's a lot of blood involved, which makes me think vampires
the main guy his job is like to protect people from i guess the vampire guy
there's cherry blossoms

anyone know what anime this is?
 
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