If you liked the Vampire Knight manga, the Anime-Planet community thinks you'd like:
To outsiders Karin appears to be a normal, cheerful high school student. However, Karin and her family are all vampires. To make matters worse, Karin is not even an ordinary vampire - she is a blood maker and must inject the excess blood into her victims! If she doesn't find a victim to bite in time, her extra blood is expelled in the form of a massive nosebleed. Karin's already difficult life is made worse when Kenta Usui transfers into her class and she finds her blood increasing at an alarming rate. When sharing classes and an after school job together make avoiding Kenta impossible, Karin must find a way to keep her rapidly increasing blood under control or risk exposing her family's secret.
Chibi Vampire and Vampire Knight are both blossoming romances between human and vampire. In Chibi Vampire, the Karan is a reverse vampire who instead of drinking blood needs to expel it. Though Vampire Knight is a bit more mature than Chibi Vampire I have no doubt fans of vampire romance will enjoy both.
For some reason the first thing that struck me between Vampire Knight and the series Hakushaku to Yousei is the hierarchy structure set for the for the characters and the aristocracy that it revolves around making some of the characters arrogant to the extreme. The supernatural ties of the series brings out the historical feeling in the characters.
Chiyuki is a young girl with a terminal disease. Near death, she meets a vampire named Touya and blackmails him into spending time with her; however, he doesn't drink blood because if he took a blood partner the partner would die long before him and he doesn't want to get hurt. When Chiyuki is dying he saves her life by having her drink some of his blood, because he feels even being with her for a little longer will be enough. She returns to school and forces Touya to join her there, where they discover that one of their classmates is a werewolf who is ashamed of being a monster. Both of them slowly become closer to Chiyuki because of her warmth, her will to live, and her non-judgmental love which heals the wounds from their pasts.
If you liked either one of these you would most definatley like the other for these reasons: 1) The most obvious, both about vampires. 2) The artwork is similar and beautifully drawn. 3) They have a similar feel to them except Mitsu Aji Blood has more comedy thrown in