Nakazawa was born in Yokohama in 1959. Her family later moved to Tateyama, Chiba, where Nakazawa's father died in 1970. At the age of 18 Nakazawa wrote, a sexually explicit story about a high school girl whose unrequited love for a male classmate leads to conflict with her mother. Umi o kanjiru toki won the 1978 Gunzo Prize for New Writers and sold over 600,000 copies in Japan. Nakazawa attended Meiji University, and married her husband while still a student.
Career
Nakazawa followed Umi o kanjiru toki with the novel and the short story collection. In 1985, when Nakazawa was 25 years old, her mother died at the age of 40. That same year, Nakazawa published, which won the 7th Noma Literary New Face Prize. After she won the award, her marriage ended in divorce. In subsequent years Nakazawa wrote several more books, including the 1999 novel, about childhood sweethearts who have a love affair despite being involved with other people, and the 2000 novel, a story about junior high school students in a brass band. Since 2005 Nakazawa has been a professor of literature at Hosei University. In 2007 Nakazawa was the subject of one volume of Kanae Shobō's Contemporary Women Writer Readersseries of books, each of which compiles selections from an author's works, an annotated bibliography, and critical essays from other authors. In 2013 a film adaptation of her novel Gakutai no usagi, starring Masaru Miyazaki and directed by Takuji Suzuki, premiered at the 26th Tokyo International Film Festival. A film adaptation of her novel Umi o kanjiru toki, directed by Hiroshi Ando and starring Yui Ichikawa, and based on a decades-old Haruhiko Arai script that Nakazawa originally refused to allow to be filmed, was released in 2014. Umi o kanjiru toki held its international premiere at the 2015 Rotterdam Film Festival under the English title Undulant Fever. In addition to her fiction writing, Nakazawa is an essayist who regularly writes opinion columns on current events for Asahi Shimbun. In 2015 she published the nonfiction book Anti-Hate / Dialogue, a series of conversations with professionals from different fields about the rise of hate speech.