Ever since she was three years old, Kaori has lived in a bookstore where the boundaries between the mortal realm and the spirit realm are blurred. Her adoptive father, who lives with her in this magical space, is a spirit himself. One day, Kaori comes across a bleeding young man who has stumbled into the spirit realm just as she did when she was a small child. Though the young man is an exorcist who has vowed revenge against all spirits, Kaori decides to embrace kindness and help him find his way back home. This supernatural book series focuses on a different adventure in each volume and features stunning wraparound cover illustrations by Munashichi.