If you liked
Suzumiya Haruhi no Shoushitsu
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...then you might like
Gintama Movie 2: Kanketsu-hen - Yorozuya yo Eien Nare
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Both movies are sequels to their respective series. In both movies, something happens and the protagonist is teleported into a familiar yet different world in which the protagonist doesn't exist. Both protagonists then proceed to make sense of why they are brought here and seek ways to return to their original world.
In both movies our main characters happen to be to different worlds where no one of those they knew could recognize them, thus making our characters firstly to feel sad and then try hard to change the world!