Keita Ibuki's contracted Motosumitama. As a child, she was princess of the Motosumitama. However, tragedy met up with her when her most cherished brother slaughtered her whole tribe. She came to the human world to stop him.
She is a huge glutton when it comes to food, most likely because she needs to keep her energy up at all times. She has a dachshund named Punipuni (プニプニ) that is almost always seen with her.
Source: Wikipedia.