[Sterling01]

Originally Posted by Eryops

Spoiler:

The plot of the first chapter is completely unrelated to Higurashi (I think that Higurashi is said to be a fictional story by the main character of the game). However, there's a hidden extra (called the tea party) in which Bernkastel appears and discusses a few things that are related to Higurashi. My personal theory is that Umineko and Higurashi take place in completely different worlds, but that all these worlds are connected to the dimension in which the witches reside.

Spoiler for :

Bernkastel also says that she is unable to interfere in Beatrice's world which I think is the world the events of Umineko happen in or it could be the world where Beatrice actualy resides in.