I read this manga about 15 years ago and all I can remember is a scene where a "punk-ish" male character is cornered in a bar and uses a hidden blade in his shoe like picrel. He kicks one if his opponents across the head stabbing him in the temple.
There was also a computer genius woman who was a nymphomaniac in her youth, and she was involved in the plot after being assigned a task guarder by a butler with erectile dysfunction lmao
I think it was post-apo, there was some cyberpunk elements but I can barely remember anything.
Any help is greatly appreciated!