This is the story of another Gensokyo, where there is an ordinary girl named Reimu Hakurei. She is not the Hakurei shrine maiden, so she does not have any shrine maiden duties. She lives her life as a regular student.

You are in the same class with the ordinary girls Reimu and Marisa, and you have fun studying and playing sports together. Don't you think it'd be nice if a world like this existed?

After school, you hang out in the hallway with Reimu as usual, and then Marisa comes by and says, "Hey! Let's go have some fun!"

Marisa takes both of your hands and drags you out to town so that you can all go shopping together. Then, Reimu suddenly stops in front of a shop. The sign reads Suzunaan.

Suzunaan is a shop selling old books, and it is very dark inside. You are looking through books with Reimu when you find one about a shrine maiden who exterminates youkai. You immediately take out your wallet and walk over to the store owner. You can't wait to read the book...