This is my Top 1 piece of fiction ever. I haven't read or played anything with a story as engaging as Umineko, that made me laugh, cry, hate, love, vibe to the amazing soundtrack, and much more.
Truly, reading Umineko is both a blessing and a curse. A blessing in the sense that you'll read one of the best, if not the best story out there. And a curse, because once you enter the rabbithole that is Umineko, there's no way out, and it'll undoubtly consume many hours of your life. Hell, I can't even count with both of my hands the number of Let's Plays of Umi that I've watched on youtube, and it's kind of effing my social life too as I just can't stop rambling on about it to my friends that are just too stubborn to give this behemoth of a VN a chance (Bear in mind that this VN has over 100 hours of reading, and it's literally longer than the bible.)
But if you don't mind long stories and want to experience peak fiction, this is for you. Umineko is at its heart, a mystery novel, and in it, a bunch of rich people from the Ushiromiya family attend the annual family conference at the patriarch's own private island, Rokkenjima. Obviously, after they arrive, fun things start happening, like murders, lots of it. And it's for our protagonist (and you, the reader) to solve the mysteries presented to you.
I won't say anything more, because this story is something best experienced as blindly as possible. But if you're new to this VN, there's something I recommend you to do before reading: Install either 07th-mod or Umiproject, they're both ports from the console version of Umineko, which is a MUCH better version of this one, as it adds new and improved graphics, and also the amazing voice acting with seiyuus such as freaking Daisuke Ono as our protagonist, Battler. (Wait, is that a JoJo reference?)
Really, the voice acting in Umineko is top tier, as everything else is.