Yamai Kazamachi are the fifth Spirit(s) to appear. However, by the beginning story, the original Yamai has already split apart into two separate Spirits: Kaguya and Yuzuru. Being identical twins, Kaguya and Yuzuru look almost the same. They both have orange hair and blue eyes and appear to be of the same height. However, watching carefully, both still have their individual characteristics. She has "the body of a model" as described by Shido. Her hair is braided in three portions, and she has a curvy figure. She has a vague expression and keeps her eyes half closed for most of the time. While her sister's Astral Dress is mainly the color purple, Yuzuru's dress is bluish-purple with a small cape and has chains on her left hand and foot. Yuzuru's height is stated to be 158cm, and her three sizes are B90/W61/H86. Despite being twins, their personalities are almost complete opposites to each other. She often speaks in a robot-like speech pattern; when arguing with Kaguya, Yuzuru always sneers at her and points out the flaw in Kaguya’s argument. She tells the point of comment before speaking the rest. For example, "Confirm; Shido". She sometimes speaks in the third person.