I still can't wrap my head around this.......
Btw spoilers (? Maybe) for Higurashi below
I always thought that in terms of timeline Umineko came first then after it came Higurashi since well Bernkastel seems to be always present in Rika from the start, like Bernkastel just got tire being a witch and decide to live on a slice of life story (lmao) but since Bernkastel clearly showed that she has memories of when she was Rika (there's clearly Hanyu and her Dad there) maybe It's the other way but that doesn't explain the dice killing arc and Bernkastel supposed involvement in the Watanagashi and other arcs movinf forward.....