Kazuki Kazami
Kazuki Kazami
Kana 風見 一姫
Romaji Kazami Kazuki
Aliases Thanatos
Blood Type B
Birthdate March 22
Age 18
Gender Female
Hair Color White
Eye Color Violet
Measurements B: 76 W: 57 H: 78
Height 150 cm
Representative Fruit Pear
Representative Flower Lily
Personal Status
Status Alive
Occupation Student
Relatives Yuuji Kazami (Younger Brother/love interest)
Satoko Kazami (Mother)
Ryouji Kazami (Father)
Voice Actor Akane Tomonaga

Kazuki Kazami (風見一姫, Kazami Kazuki) is Yuuji Kazami's elder sister who disappeared when Yuuji was ten years old. Despite her delicate and diminutive body, she is so intelligent that she can be called a genius. She was the same age as Amane Suou. They both went to the same school, “Takizono Private Academy”, and were on the basketball team. She "died" in a bus accident which greatly influences Yuuji's and Amane's life. After her "death", her mind was integrated with the Thanatos System by CIRS. Later on, it was found that she still has a functioning body.


Kazuki has long, white hair, violet eyes and a fragile-looking diminutive body. Yuuji notes that Kazuki usually had on a rather sleepy expression in contrast to her sharp attitude and keen intellect. In Eden, she used a fake prosthetic hand/claw for the humor of it.


Considered a genius, Kazuki's intelligence greatly surpasses her peers. This allowed her to quickly grasp any skill within a matter of days. Although her attitude can be considered sharp and somewhat pragmatic at times, she genuinely cares about those important to her. Her intelligence and calm composure allows her to think significantly far in the future, even in stressful situations. Both Yuuji and Amane describe her outward appearance and tone as distant and sleepy.

Kazuki reveals to Amane that she loves her brother, Yuuji, more than anyone else. She bathed and slept with him up to her disappearance, and went as far as teaching Yuuji about the female body. These confessions led Amane to diagnose her with a brother-complex. It should be noted, however, is that Kazuki is never to spoil her little brother in any way. Despite the love she gave to Yuuji, she still wants Yuuji to be a man who can stand on his own feet.


Kazuki Kazami is Yuuji Kazami's older sister, who loves and takes care of her brother. Her desire to make Yuuji happy causes her to develop a brother-complex for him. Several years before the main events of Kajitsu, she and her basketball teammates were involved in an accident. Along with Amane, she survived the ordeal, but her survival was concealed. After being secretly rescued, she was used as the Thanatos System's core.


Main article: Relationships of Kazuki Kazami


  • Her name 一姫 (Kazuki) means "One, Princess".
    • Kazuki is mostly a masculine name.
    • Kazuki is an odd way to speak her name, which should be "Ichihime".
  • Her height has not changed during her time as the Thanatos System's core. Due to this, she is shorter than most of the other characters.
  • Her brother-complex towards Yuuji was likely caused by her desire to counteract the negligence he received from his parents due to her superiority.

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