She is a girl that was in the hospital for a long time.
She has long black hair, wears a hospital night-gown and sits in a wheelchair. When reality was altered, she had her hair in braids, and wore the school uniform.
At first she kept to herself and didn't want anyone around her, she greatly missed her "friend" the doll Lulu, who had been turned into a human in order to make her happy. Later, because of Samatarou revealing his position as God's son, to make sure no one would know, time was rewound and reality was altered so that no one except Samatarou could remember. Because of this, apparently Shinichi became her boyfriend, and Lulu never existed, meaning she never lost her friend, which is why she isn't sad. She often would get mad at Shinchi when he would flirt with other girls out of habit.