In a certain era, the land of Gensokyo was separated from the rest of the world by a barrier and it built up its own unique culture. One day, people start buzzing about strange phenomena. They suspect that a youkai is using the Honjo Seven Wonders to hide some evil deed, but...?

(W) Moe Harukawa (A) Zun Whether it's a mysterious dine-and-dash incident or a prophetic old book, a Kokkuri spirit or a suspicious subscription service, Kosuzu's supernatural hijinks in the world of Gensokyo continue.

(W) Moe Harukawa (A/CA) Zun Whether it's demons or humans, business is booming! On another busy day at book rental shop Suzunaan, Kosuzu can be found working. Ever-curious about the mysterious and unknown, she finds herself repeatedly drawn into disturbing rumors that have overtaken Gensokyo! Joining her as always are Reimu and Marisa, but a brand-new face is also set to appear!

(W) Moe Harukawa (A/CA) Zun 'The human heart that fears demons gives them their existence.' With the knowledge of the mysterious relationship between humans and demons, Kosuzu starts in pursuit of Gensokyo's 'truth'…but what does she find waiting for her?!