You know by now, right, that The Melancholy of Haruhi Suzumiya S2 finale'd on Animax last Wednesday? Well, this bookends.

© 2009 Nagaru Tanigawa · Noizi Ito/a member of SOS
The Disappearance of Haruhi Suzumiya premieres 1 June 2011, Wednesday, 7PM WIB (UTC+7), on Animax Asia. Japanese audio with subtitles.
Read more »One morning Kyon arrives only to find that everything has changed. Haruhi and Koizumi are both missing and Ryoko has mysteriously returned. On top of this, Asahina can't seem to recognize Kyon and Nagato is just an ordinary human. For some reason, Kyon is the only one aware of the changes and no one remembers about Haruhi or the SOS Brigade.
Kyon finds a clue left by the alien version of Nagato in the form of a bookmark. She tells him that he has to gather ‘keys’ to run a program. After bringing all the necessary keys for the program built by the alien version of Nagato, Kyon is shocked to find who is behind everything.
–Animax synopsis
07-Ghost 「07‐GHOST」 by Amemiya Yuki, Ichihara Yukino
Ichijinsha Comic Zero-Sum, josei
Volume 5 (chapters 24-29) first published in Japan 2007.11
Awards
Double-first prize, 3rd Zero-Sum Comics Grand-Prix
Related series
07-GHOST CHILDREN (side story; one volume)
Other languages
Alternative English 07-GHOST (Go! Comi; 7 volumes, dropped), French (Asuka éditions tome 2 per 2010.12.09)
Adaptations
Studio DEEN's 25-episode anime adaptation aired in Japan from April through September 2009, starring seiyuu Mitsuki Saiga (Teito Klein), Namikawa Daisuke (Mikage) and Hayami Sho (Ayanami). Since the anime ended, limited edition genteiiban have been bundled with the DVDs.
Audio drama: The 07-Ghost: Kamisama ni Todoku Koibumi drama CD was released in Japan in 2007. The second 07-Ghost: Seventh District shipped February 2009.