Yamai Kazamachi (風待かざまち八や舞まい, Kazamachi Yamai) is the fifth Spirit to appear. However, by the beginning story, the original Yamai has already split apart into two separate Spirits: Kaguya and Yuzuru.
Yamai was originally one Spirit, but she was split into two bodies and minds. The original personality of Yamai is now gone, as well as what type of character she used to have is unknown to the split Yamais. 
||Yamai Kazamachi was born a vanishing twin, with her absorbing her stillborn twin while still in utero. She grew up to become an ordinary high school student heavily involved in anything she could participate in like music and athletic activities. One day, around the age of 17, she saw a child that was about to be hit by a vehicle. Wanting to be like a hero she always admired as a kid, she moved to save the kid at the expense of being struck in that child's place. As her consciousness started to fade, Mio appeared and gave her a Sephira Crystal to save her life. However, rather uniquely the Sephira Crystal reacted bizarrely with the DNA of her stillborn twin sister as well, causing the original Yamai Kazamachi to split apart into two. The subsequent twins Kaguya and Yuzuru both inherited different aspects of the original's personality and preferences. Over time, both twins forget about their human life, only remembering that they both originally came from one Spirit called Yamai.||
||Upon taking in Beast's Eighth Sword, both Kaguya and Yuzuru grabbed the spiral blade at the same time and kiss, causing their bodies to temporarily merge and fuse as one. In turn, this causes a recreation of the original Yamai Kazamachi to be reborn. However, Yamai considers herself different than the human Yamai Kazamachi due to the personal growth that both Kaguya and Yuzuru have developed after splitting apart.||

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