Perfect Blue (1997) is so intense.
I recently got a tv that can play 4k for the first time, so I've been slowly collecting 4k anime films, mostly retro. I saw Perfect Blue was an option. It's been years since I saw it and all I remember about it was that it was a cool psychological thriller about an idol, so I picked it up.
Holy shit. I completely forgot nearly all of the film. The >!stalker(s)!<, the psychological unwinding of the main character, the cruelty of the former fans, the complete indifference of grinding her under the wheels of the idol/model/film industry. The way you understand exactly how she's feeling at any given moment, all of her fear, shame, and anxiety and the pressures that make her do what she does.
Maybe because I avoid the horror and thriller genres generally, but I haven't seen a film this intense in a long, long time. I feel dazed after watching it. What a masterpiece.