The first time I saw Perfect Blue was five years before Black Swan. I saw the resemblances. However, I would consider it a rip-off. If everything Tarantino has produced were a rip-off, the entire catalog would qualify. I think it influenced the director, despite his denial. One of the most incredible anime filmmakers ever, Satoshi Kon. Throughout his career, I think he's been overlooked. For instance, the similarities between Perfect Blue and Black Swan are too obvious to ignore, with both films featuring a female lead struggling with mental health issues, a stalker, and a descent into madness.