Tensei Akujo no Kuro Rekishi

In her teenage years, Konoha Satou wrote some cheesy romantic fictional stories for fun. Now, somehow, she got trapped in her own stories as a cruel villain. She somehow remembers all the details of her story, and in this way, she manages to survive. Later in her stories, she met a character, Yomi, about whom she didn’t remember whether she even wrote about him or not. Now she wonders, does she have to believe him or not?