[Comprehensive] It's so Cool to Be a Mary Sue

Yuko Ohmaeda, female, is now sixteen years old. She is an ordinary female high school student who is so ordinary that even she can't help complaining that her life experience is too ordinary. On her sixteenth birthday, when she was suffering from chuunibyou, she quietly made a wish to be a Mary Sue in front of a candle, but she received a response as if she was being teased by fate—— [——I understand, although I am a bit reluctant now... But I will try my best to fulfill your wish. ——That's where everything begins. Mine clearance matters: ①Happy black mud literature, the ending is destined to be BE. The early Suwen plot is enjoyable and has some spoof elements. Cookies have not been written in hundreds of years, so some parts may appear to be deliberately funny. Some descriptions may be a bit awkward due to Japanese light novels, so please consume with caution. ②Part of the inspiration and settings come from horror games. Although I really want to wait until the full text is completed before adding more explanations, I still want to be just in case. But having said that, writing it here is actually a spoiler (sad) ③I'll add what I think of, great! Purpose: Feudal superstition is unacceptable