Takashi Natsume, familiar with youkai encounters thanks to his grandmother's Book of Friends, delves into a world where he learns about these supernatural beings, his own history, and builds connections. The coveted book, a means to command youkai, attracts both spirits and exorcists. Amidst Natsume's desire for a tranquil existence, he grapples with disruptions caused by his unique abilities. To find solace, he must delve deeper into the mysteries of the book, the practice of exorcism, and embrace the support of others.