Shouko Futami

Futami Shouko possesses such power that she has transcended her physical being. She exists outside of space and time. Even before losing her physical form, Shouko was able to travel in both time and space at will. Shouko has foreseen the upcoming "Upheaval" and that the Kirihara brothers will play a pivitol role. She has been watching over them and guiding them. She always appears in her school uniform.

(Source: Wikipedia)