Natsumi, a talented swimmer, is the object of Yuusuke's affection, but this is not to her liking. She has difficulty being close to people since the death of her older brother, Fuyuki, whom she was very close to. Because of this pain, she is prone to biting people's heads off at the slightest provocation. Noelle only reminds her of her childhood, and she has flashbacks of her past, sometimes prompted by Noelle.