hello, to be honest I has never been very fond of visual novel, mainly because I am not so attracted to the "date sim" aspect of the majority of them. Umineko is a very special case, thought i know there are some very good stories even in those with erotic contents.
I don't really remember any other story that made me think about it more than umineko, but well this is mainly because umineko is a puzzle a giant riddle, and there's a lot of time to think about the solution before it is given.
Anyway in the novel field I certainly recommend Ever17. As for the anime the recent "Higashi no Eden" was pretty interesting, though there are a few development I didn't find quite satisfactory and the true end should happen in the movies they are going to release.
Saint Luminous High School is another series with mystery factors, and sort of harem contents as well, but I have found it very enjoyable.
And I strongly recommend the movie "Perfect Blue". A visionary mistery movie.
Kinda different in the concept but Rumiko Takahashi's Mermaid's forest is another great miniseries with a lot a mysterious situations and unexpected developments.
Hi, I am new to the forum. I don't really know anyone so I hope we can get along well. =p I am wondering if there is any other anime/manga/novel that you spend the same amount of brain power/time as Umineko? xD