Recommend something similar to Umineko please
Already checked out Ten little niggers, ace attorney, higurashi and 999/VLR/Ever17
Have you tried other ryukushi works besides umineko and higurashi?
Higanbana is a cool but short set of stories about paranormal activities in a school building and some spirit-realm shenaningans laced with a message about dangers of bullying.
Rose Gun Days is more action oriented with some easy and completely skippable QTE's story about gangsters, alternate history, politics and japanese patriotism
Both sport amazing soundtrack and has lots of expy characters that are visual references to those from R07 earlier works.