Anita King, Maggie Mui, and Michelle Cheung are known as the Paper Sisters. They operate the Three Sisters Detective Agency in Hong Kong, a firm focused on solving cases related to books. They are engaged as local guides for Nenene Sumiregawa, a Japanese novelist who has been suffering from writer's block since the disappearance of her long-time friend, Yomiko Readman. The sisters are all Paper Masters—people with the ability to manipulate paper—and using their powers, they rescue Nenene from dangerous terrorists who target her during a book signing. However, in case the attackers strike again, the sisters stay on as her bodyguards to shield her from further harm. This situation is a dream come true for book lovers Maggie and Michelle, who adore Nenene's stories, but the young Anita cannot stand books despite her paper-controlling abilities. The trio struggles to adjust to their new daily life in Japan, guarding Nenene while continuing their detective work under a mysterious organization called Dokusensha. Yet, the more they learn about Nenene, the more they uncover the connection between her, Yomiko's disappearance, and the mysterious books that Dokusensha sends the Paper Masters to investigate. What started as a simple job turns into a larger case than they have ever encountered before. Are these girls truly willing to risk their lives over literature?