The Melancholy of Haruhi Suzumiya Part Five Episode 13

Haruhi enlists the help of Kyon to attempt to investigate what happened to Ryoko, as Haruhi believes it strange that she would transfer without notice. After a fruitless search, Haruhi tells Kyon about her earlier years, and how she changed from an ordinary girl into her present state. Later that day, Itsuki tells Kyon his organization's theories about Haruhi, and shows him some of his powers within a sealed reality.