Shoko Futami (Night Head 2041)

Shoko Futami is a mysterious teenager in a school uniform that seems to guide or attempt to guide various characters. She first appears to the Kuroki brothers during a raid on a criminal religious group. Then she appears to the Kirihara brothers, where she is more successful. When the Kirihara brothers are transported to Russia, they find Shoko is actually confined to a life support machine, and the apparitions they saw were actually psychic projections of her.