I wish Japan were still making dramas in this way. The way they make dramas now is okay, but back in the '90s their mojo was topnotch. I particularly liked how they incorporated the romance, without it taking anything away from the psychological element.
I love this genre too, but much better in movies than dramas, personally. It's a genre that Japan excels at, as someone above mentions:
These are movies, but they will totally f#¤%! you up ... I'm sorry for the cussing, but no other word is appropriate to describe the mayhem in these films. They're a must for any fan of the psychological thriller genre!