I was Summoned by Mistake, but I'm the Heroine

I was Summoned by Mistake, but I'm the Heroine manga summary: Sequel to "+a no Tachiichi". Imagine getting summoned to another world, and then being told that you were a mistake!? That's the situation our main character, Kakura Norio, has gotten herself into. Join Norio-chan in her attempts to survive in a complicated isekai political situation, just like Satoki in +alpha no Tachiichi!