Riho Yamazaki

Riho is an orphan high-school aged girl whose entire family were killed by nightbreeds. She works as Shido's secretary, but is initially unaware he is a vampire. She learns Shido's secret while attempting to help him with an investigation, but decides to continue working for him anyway. After she is fatally injured by Cain, Shido turns her into a vampire to save her.

Two of her human friends are Shunichi and Mikako, and she liked the performances of the actress Yukie Tsukimura.

Personality:
Riho also has an obvious crush on Shido and continually tries to earn his affections, however her attempts are clumsy, leading her to be jealous of Yayoi. Her personality is quite cheerful and as been described as being "a bright light in the darkness."

History:
Riho had been working as Shido's secretary for some time before the start of the series, but is not told by Shido that he is a vampire or about the existence of nightbreeds. She learns the truth at the end of Episode 1, A Visitor in the Night, after she is possessed by a nightbreed.

In Episode 4, The Golden Dawn, Cain fatally injures her and forces Shido to sire her into a vampire. Shido tells her that she will hate him for turning her into a vampire, but she insists she will never hate him.