Fuji (Wの悲劇, Daburyū no Higeki, The Tragedy of W) is a Japanese novel by author Shizuko Natsuki, originally published in 1982.

Chiyo had brought along her friend Jane Prescott to spend the New Year holidays with her family: Yohei, grandmother Mine, grand-uncle Shigeru, mother Yoshie, stepfather Sawahiko, cousin Takuo, and Dr. Shohei Mazaki, who's rumored to be an illegitimate member of the family.

When Yohei is killed, the investigation is undertaken by detectives Ukyo Nakazato and Katsubei Aiura, who have more questions than answers.

The answers will be decisive for the Wada family to stay together - or break apart... For the English version of the book, the Japanese character Harumi Ichijō (一条 春生, Ichijō Harumi) was replaced with the American character Jane Prescott.

This character was not changed in audiovisual media adaptations, although Harumi Ichijō has varied degrees of relationship with the rich heiress Mako Watsuji (和辻 摩子, Watsuji Mako) depending on the adaptation.