The Mythical Origin of Gensokyo

The protagonist suffers from a secondary disease, and his IQ drops from time to time. Ps: This book contains confusing characters. I actually don't know much about the East, so when I wrote it, I could only use the basic knowledge I had to make up new myths. If you are a newbie, please include it. This book is yy, please wait for me to improve it. The magic modification is serious, and those who feel uncomfortable can close it. This book was written before it was set and was perfected after setting, so the settings are a bit... Um... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.