From MangaHelpers:

In ancient Japan, the Shogun established the Ooku, a harem of beautiful females, to give birth to and raise the heir to the throne. But 400 years later in a timeline slightly different from ours where the military empire still exists and Japan is still closed off from the rest of the world, the Ooku is in chaos. What used to be full of gracious and refined ladies, the girls now are violent and rude. They do as they please, get themselves into shenanigans and wreck havoc around the castle! [vyc]

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From MangaHelpers & Kirei Cake:

Vampires now coexist with humans by forming contracts with human beings. Vampires who form these contracts become their pets, serving their every need. They are given pet collars, distinguishing them from wild vampires, which are still very dangerous.

Daichi really wants a pet vampire, but his older sister won't hear anything of it. One night, a wild vampire princess named Iko breaks into his house! Iko discovered that Daichi's older sister has the extremely rare blood of Chernobog, which she believes would make her powerful enough to destroy the anti-vampire organization called Abraham once and for all.

However, the blood doesn't work exactly as Iko expects, and this vampire soon finds herself forced to become the pet of Daichi and his older sister...