Mayuri

Mayuri is a Spirit born from the Reiryoku that Tohka, Yoshino, Kotori, Kaguya, Yuzuru, and Miku unconsciously emitted due to their stress and desire to have you all to themselves or whatever they decide. However, since she was created from their Reiryoku, she would eventually disappear for she doesn’t have a physical form. Mayuri is a calm girl who rarely shows her emotions. She usually follows you around to observe your dates with the Spirits; to fulfill her and her Angel's goal. In the beginning, Mayuri did not seem to be bothered about the fact that she would eventually disappear. However, after seeing you go on a date with each of the Spirit girls you had sealed, she develops the desire of wanting to live and not disappear, along with the feeling of jealousy of those other girls that she unconsciously develops that later prompts Kerubiel, her angel weapon, to go berserk. Her Angel can shapeshift into weapons. Curious as well.