The Gensokyo of Humans by Ashiyama Bungaku Touhou Project Doujin

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Chapter 1 released Dec 24 '19
Chapter 2 released Jan 7 '20
Chapter 3 released Feb 9 '20
Chapter 4 released Feb 26 '20
Chapter 5 released Mar 31 '20
Chapter 6 released Apr 30 '20
Chapter 7 released May 25 '20
Chapter 8 released Jun 30 '20
Chapter 9 released Jul 27 '20
Chapter 10 released Sep 2 '20
Chapter 11 released Oct 4 '20
Chapter 12 released Oct 27 '20