 If you liked
Suzumiya Haruhi no Shoushitsu
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 ...then you might like
Zoku Owarimonogatari
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Movie finales for series in which our main protagonist enters/gets put in another world which can be described as an alternate version of what they are usually familiar with in an unexpected manner.
Both have similar starting plots. Disappearance takes a much more emotional route than Zoku does but I think both pull off their stories and conclusions amazingly.