The film's title, "''The Pillow Book''", refers to an ancient Japanese diary written by Sei Shōnagon, actual name believed to be Kiyohara Nagiko, from whence the protagonist's name in the film.
A veteran high school teacher befriends a younger art teacher, who is having an affair with one of her 15-year-old students. However, her intentions with this new "friend" also go well beyond platonic friendship.
A tough, street-smart kid serving a sentence in a state youth reformatory meets a beautiful, innocent girl studying at a nearby convent. When forbidden love blossoms between them, they must fight the prison authorities, their parents and the law.
In the late 1990s, the arrival of elderly invalid Patrick into Marion and Tom’s home triggers the exploration of seismic events from 40 years previous: the passionate relationship between Tom and Patrick at a time when homosexuality was illegal.
A failed novelist's inability to pay the bills strains relations with his wife and leads him to work at an escort service, where he becomes entwined with a wealthy woman whose husband is a successful writer.
Believing they have left behind shadowy figures from their past, newlyweds Christian and Ana fully embrace an inextricable connection and shared life of luxury. But just as she steps into her role as Mrs. Grey and he relaxes into an unfamiliar stability, new threats could jeopardize their happy ending before it even begins.