Yozuru was first introduced in Tsukihi Phoenix. She is an onmyōji and one of Meme's clubmates at the university. One of the most notable thing about her is that she does not step on the ground. Between the three kouhais during university, she was the only one that graduated. She is physically the strongest human in the series and fights by using her fists that are powerful enough to punch through multiple floors at once. It was revealed that as an exchange for her immense strength, she was given a condition to never step on the earth. Unlike Meme, Deishu, and Gaen, she works for free which means that she only hunts and kills oddities because that is what she truly wanted. Yozuru says that she is fond of Koyomi as an individual, however if Koyomi makes a move that is going against her sense of justice, she will not hesitate to kill him. Yozuru uses her judgement on which immortal kais to fight and hunt by separating them into what is alive forever and what is dead forever. She then hunts kai that are considered alive forever and that's why Yotsugi is her assistant as Yotsugi is technically not alive.
During Tsukihi Phoenix she received information from Kaiki concerning a phoenix. Her specialty is immortal Oddities. She considers herself as an ally of justice and would not hesitate to eliminate immortal kais despite the consequences.
