If you're looking for anime similar to Vanishment of Haruhi Suzumiya, you might like these titles. All recommendations are made by Anime-Planet users like you!
The students of Tomobiki are working long hours and preparing feverishly for tomorrow, when the student fair finally will begin. It has been a long, difficult job, and everyone is relieved, knowing it will soon be done – but there’s a catch. They soon discover that days, possibly weeks have passed, yet they never reach tomorrow, and the student fair still has not begun. As they desperately try to discover what is happening to their world, their beliefs on reality and the world of dreams are radically challenged. Is the gang doomed to repeat the same day for the rest of their lives?
When you take the cast of a beloved series, and place them in a unique situation, that feels right out of a Twilight Zone episode you get these two movies.
The animation is higher caliber, the story is complex and tight and there is a mystery in both.
Do you need to see the series to understand them? Not totally. Would it help? Kinda, BUT
Only in the case for Suzumiya. In the case of Urusei Yatsura, just understand it was a much zanier comedy than the movie beautiful Dreamer is. This is why the incidents seem so odd to the cast.