if you want to get it in english, you can go to the website witch hunt, and there you can download it.
Yes, the magic circles in Umineko no Naku koro ni are very real. They are taken from the book "The Key of Solomon".
The cast of Umineko - 2004 includes: Mimura as Miki Noda Motoki Fukami as Takashi Ueda Katsunobu Ito Toshie Kobayashi as Tae Hijiri Kojima as Keiko Yoshiko Mita as Tami Ueda Junko Miyashita Kayoko Shiraishi as Misako Akagi Jun Toba as Shusuke Takayama Tomomi Tsunoda as Sachiko
No. Only related thing is, that the creator team is the same ---- Well the genre is same: Mystery, Horror, Psychological, Thriller//Supernatural
Well, there hasn't been any info about it yet, so it it's anyone's guess whether they're even planning on making the second season.
There is no such thing because viz (the owner of the english copyright) has stopped translating due to lack of profit. But you might be able to read it online at a website when it gets a fan translation
You can find the first four chapters in English at Onemanga here: http://www.onemanga.com/Umineko_no_Naku_Koro_ni/ However, I still don't know where you can find the rest in English.-If you mean the VN you can look into various visual novel download sites, I believe the 8th part is currently being translated.
After... - visual novel - happened in 2003.
Crescendo - visual novel - happened in 2001.
Clear - visual novel - happened in 2007.
After... - visual novel - was created on 2003-06-27.
Él - visual novel - happened in 2000.
Routes - visual novel - happened in 2003.
Edelweiss - visual novel - happened in 2008.
"Él" visual novel was created and released in 2017. It was developed by Tubik Studio.
"Air" is a visual novel that was developed by Key and released in Japan in September 2000.
Clear - visual novel - was created in 2008-02.
Crescendo - visual novel - was created on 2001-09-28.