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Utsuki is one of the three protagonists and the main character of the Yin Phase. She is Doman's younger daughter. Ever since their father disappeared in Fujiwara's manor, she and her sister, Kureha go to a mansion to search for their father. Once there, they become separated and the player takes control of Utsuki.

She's a sensitive girl yet a well spell caster. Along the story she is seen as a worried girl about her sister who goes missing and her father.

Back at the shrine, she has a garden next to her room where she always observe its irises.