I haven't read the whole story of this novel yet and I forgot to put this on my reading list and I can't remember the title. I only know that the female protagonist is chuunibyou (8th-grade syndrome) and at the beginning of the chapter, the mc seems to be playing herself as a character from the anime she had watched in her room. By the way, I don't think this novel is a fantasy or quick transmigration story, it is just a normal modern psychological (I think) story. I tried to use series finder here in NU but I still couldn't find it. I'm pretty sure I saw it here in NU more than a month ago. You can also list a novel with a female protagonist that has chuunibyou syndrome. If anyone knows about this novel pleaseeee tell me, I am currently collecting a new novel and putting it on my reading list enough for me to read for a few months.
I finally found the novel! It's called Hello, Old times. Also, I think I got it wrong when I said Chuunibyou. It was about the growth of a girl with a mary sue illness.