This game was the first game that made me ever cry.
Aaaand the gameplay is shallow, but there hasn't been a piece of media that has nailed the visuals, sound, designs, ambiences and storytelling that made me feel so specifically nostalgic, guilty, ill and empty with such a fascination.
This is obviously insanely subjective, but the story is really good, wouldn't miss on it.
This is also my favourite black rock shooter instance, above any other peice of media produced that isn't the original illustration or the vocaloid song.