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A young girl who inherits her grandmother's old mansion. As soon as she moves in, she finds out that there are two vampires that already live there: Kuroboshi and Alshu. At first, Kiyo and Kuroboshi's relationship was a flirt-and-hit relationship, but later on in the manga, Kiyo slowly starts to have feelings for Kuroboshi. Kiyo is a very nice and trusting person, and she often helps out her friends. This confuses Kuroboshi, but it makes him admire her more. Later on, she decides to take on a part-time job to earn some money since both Alshu and Kuroboshi are unemployed. Her feelings for him flutter from admiration to annoyance and then to a bit of a crush.
When Sou-kun returns, she feels that she must hide Kuroboshi's vampiric nature from him, especially since his sword can already detect evil auras. However, this causes Kuroboshi to grow jealous and eventually leads him to bite her. Sou-kun witnesses this and finds out that he is a vampire. She does not feel anything toward Sou but friendship, and when she is ready to accept the position Kuroboshi's bride, Sou-kun warns her that there is a chance she will become a vampire if she does. This makes her very unsure and thus, Kuroboshi thinks she does not want to stay with him. He ignores her until the play, when he confesses his true feelings. Kiyo is touched and she kisses him right then, sealing their bride contract. They end up together, but Sou still promises to be her guard since Kuroboshi is so weak - being only hit by the back of his sword and being unable to walk afterward.