Reddit does a good job of helping me understand things.
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So if I understand correctly, Himegami’s Deep Blood ability attracts vampires and makes her kill them which is beyond her control. She doesn’t want to kill them and goes to Academy City, hoping they know what’s up with the Deep Blood ability and she can get rid of it. They don’t, so she teams up with Aureolus. Aureolus tells Himegami that he needs a vampire sample in order to save someone, so that’s why she goes outside of the seal, hopefully attracting a vampire for Aureolus. Presumably this is in exchange for his help to get rid of the Deep Blood ability, as in get me one vampire to use for sampling and I will get rid of the ability for you?
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