Passage: Umineko When They Cry is a murder mystery game described as a "sound novel" by 07th Expansion. A sound novel is similar to a visual novel, though the gameplay requires no player interaction as the game is composed entirely of text dialogues. While a visual novel's basis would be the visual aspect, as the name suggests, a sound novel's basis takes more care in producing an atmosphere via the music, sound effects, and the story itself. As such, the original Umineko games have a simple-looking art style, which stays consistent over the course of the series' releases. The original releases contain no voice acting for the characters.

Question: What art style did the original releases of the Umineko games have?
no voice acting for the characters.