Pillow Book is a famous collection of widely read Japanese essays written by Sei Shonagon (966-1017) during the early 1000s whilst she was in the service of Empress Teishi. The Pillow Book was thought to be a way for her to express her innermost thoughts and feelings which she was unable to express publicly due to her lowly position in court.
The Pillow Book is the theme of this new series from Sailor. Various subjects were touched in this collection of poems and anecdotes, however one that was frequently mentioned are the four seasons.