She is Houko's younger sister and author of the killing good called "The Injection of Eternal Sleep" that can kill people either by being injected or being knicked. She's often very unpredictable and constantly on the edge when her lust for blood  is not satisfied which is why she is very much depended on Houko as her "Instead." Her first victims are her parents, in which Houko took the blame for it so as to keep her from being incriminated.  It wasn't clear why she and her sister, Houko refer to themselves as "twins" when they're neither identical nor fraternal, however it is hinted that it was the bond that they have for each other that they refer to themselves as "twins."

Haimura Kiri is a seemingly ordinary boy with one slight problem: he is obsessed with cutting other people's hair. One day he meets Mushiyanokouji Iwai, the "Hair Queen" who cannot cut her hair because of an inherited curse. Kiri finds out that his scissor, "Dansai Bunri no Crime Edge" is the only thing that can cut them. But little did he know that their meeting sparked the start of an old murder game to kill the "Hair Queen" using the cursed killing tools, the "Killing Goods." Can Kiri protect Iwai from the Killing Goods Owners? Let the game begin!


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Haimura Kiri is a seemingly ordinary boy with one slight problem: he is obsessed with cutting other people's hair. One day he meets Mushiyanokouji Iwai, the "Hair Queen" who cannot cut her hair because of an inherited curse. Kiri finds out that his scissor, "Dansai Bunri no Crime Edge" is the only thing that can cut them. But little did he know that their meeting sparked the start of an old murder game to kill the "Hair Queen" using the cursed killing tools, the "Killing Goods." Can Kiri protect Iwai from the Killing Goods Owners? Let the game begin! <br><br>
(Source: MangaHelpers)

Yamane Byouinzaka