Tsukihi is the younger sister of both Koyomi Araragi and Karen Araragi, and the youngest member of the Araragi family. She is the younger half of the Tsuganoki Second Junior High School's Fire Sisters.

    Unlike her sister Karen, she prefers doing indoor activities. Contrary to her personality, she constantly changes her hair style and is short-tempered to the point that Koyomi describes her as having hysteria. Rosokuzawa is mentioned to be Tsukihi's boyfriend by her brother, and she says she's in love with him but has a chaste relationship. Despite being a member of the Fire Sisters, Tsukihi admits that she doesn't have the drive to do things like her older sister, although she says that she shares her siblings' belief in justice.

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