This slipped my attention somehow until I watched it in a screening rum of the fabulous local con (Con-Jikan; thanks, Tommy). If I heard about it, I took it for one of those other -chan offsprings of Haruhi in 3-minute format. But Disappearance of Haruhi-chan is different. As much as I can tell, it is a derivative of the Disappearance movie, rather than the series, and is set in the world where Kyon makes the opposite choice. And... It's not bad. Maybe he really should have. Unfortunately, I only watched 2 or 3 episodes and had to quit just when Haruhi appeared and started dragging the whole show... if not into the toilet, but at least somewhere she's apt to drag it. It could still be terrible in the end.

UPDATE: Evirus reminded me that the title is actually "Disappearance of Nagato Yuki-chan".