Krauss and Natsuhi's daughter. Although Jessica is the heiress of the Ushiromiya family after her father, she is an energetic and tomboyish young woman who lacks the more refined behavior expected of such a role. Due to her rebellious nature, she is resentful of her parents for the pressures they place on her regarding the family headship, but still shows concern for them.

She has a habit of faking asthma attacks as a means of escaping from tense situations. She has a crush on the servant Kanon.

She is also proficient in the use of brass knuckles.

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