Yotsugi was first introduced in Tsukihi Phoenix. She is Yozuru's shikigami. She always addresses herself with the masculine first-person pronoun boku and thinks of Yozuru as her sister. She has an ability called Unlimited Rulebook where she can shape-shift her finger.  She tends to end the things she says with "I said, with a posed look" (僕はキメ顔でそう言った, Boku wa Kime-gao de Sou Itta). She is an eccentric person with many emotions but is unable to show them due to her being a shikigami.

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