Kadaka's little sister, who is actually in middle school. She consider herself as a vampire.
Kobato is Kodaka's younger sister. She is a middle school student, but also joins the club. She is very close to her bother, who she calls "An-Chan". She behaves in a jealous and clingy way when she feels that he is nog giving her enouge attention to the point where it is obvious that she has a brother complex. She sees Maria as a rival for Kodaka's brotherly affections and so often gets into fights with Maria. Despite being older than Maria she has smaller breasts than her, which Maria is always eager to point out.
Kobato has had a penchant for darkness, vampires and the macabre since she started watching the anime Full Metal Necromancer. As a result, she often speaks in an affected fashion, she claims to be known as the ancient vampire "Reisys VI Felicity Sumeragi", and she wears a gothic dress and has a red contacts in her right eye. But this façade quickly breaks down when she gets emotionally worked up and she speaks in a strong Kyūshū accent. Her behavior does not for the most part differ from that of a regular girl (procrastinating with her homework, staying inside when it is hot, etc.) which Kodaka points out. That causes her to be embarrassed and slightly lose character. Moreover, she is not very good at mathematics, taking a long time to solve a question Kodaka posed to her, and displays a rather limited vocabulary, frequently getting words wrong.
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