I remember there was a manga about a high school girl who is trained in martial arts and sometimes uses nunchaku. There is a memorable chapter about the main character who is worried about betrayal of her friend.

I know it was scanlated in English
.
I also think it is an old manga because the art style looked very eighties or early nineties. .

I have tried remembering the title so hard but I cannot remember it. So what is the title of that manga I've described?