Hi no Sakana is a Japanese novel by Murō Saisei; it was first published in 1960, and was later adapted into a single episode TV drama that was broadcast on NHK Hiroshima in 2009. The story describes the interactions between an elderly author and a young staffer from a publishing company as they collaborate on a book cover design for the author's latest novel.
Saisei based the interactions on her own experience when she was writing Mitsu no Ahare, and was working with book designer Kumiko Tochiori in 1959. The novel is written as a collection of letters between the two.