Chizuna's younger brother.
Recently afflicted by a "vampiric" condition that is passed down through the Takashiro family, he bears his mother's last name. At the beginning of the manga series, he admits to himself that he is in love with Yaegashi. However, after having a dream where he kills her for her blood, he pushes her away. As Kazuna gradually cuts ties with Yaegashi, he begins to develop feelings for his sister. The two even share a kiss—once in the anime and twice in the manga.
To help manage his condition, Chizuna provides him with two bottles: one containing a serum that gives her some relief and another for suicide if his suffering becomes unbearable. Towards the end, with Chizuna nearing death, he declares that he will take the suicide medicine because he cannot imagine living without her. Both are later found unconscious on the floor of Chizuna's bedroom. In the anime, he dies. In the manga, the next chapter shows him in the hospital with no memory of the past year. According to Chizuna, he resembles their father.
