I just recently watched the anime. I want to know if the anime is any different from the manga, specially in terms of the ending. Whether the anime had an original ending etc.

Yes, it is a bit different, manga is tad bit darker. The main differences are

the circumstances of Yuuko's death. Soon we will know how it ends so nothing is decided yet though. I like both stories regardless of those changes, although when asked I would probably recommend watching anime first.

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hey is niiya actualy a glasses character or not?

Anime was crap.
Manga was great.