Kimi no Koto Mainichi Oishiku Tabetai yo

Eleonore, feared as one of the two most "evil" vampires, was in poor health due to her indiscriminate blood-sucking. One day, she met a healthy-eating man by chance and drank his blood, awakening her interest in healthy "food"! In order to suck his delicious blood every day, she made a contract with him, and the two began living together...!? (Source: Akita Shoten, translated) Note: Includes one extra chapter.