Fukaya Shinichiro's whimsical grandfather has decided, quite out of the blue, to hand over one of his many holdings, a bookstore known as the "Fukayadou", to his high school-age grandson!

Shinichiro is understandably reluctant, but when he sets foot in the store only to be immediately drawn into a world full of fantastical books that thrive on human emotions, and meets the handsome blond man with a mysterious smile who works as its manager, he realizes his life will never be normal again.