Asked by AFP, Shinchosha was also unable to say immediately when translated versions of the novel will appear.
The publisher was content to specify that the Japanese manuscript represented 1,200 pages, without specifying the number of pages that the book will have once printed.
Aged 74, Haruki Murakami has been consistently considered a favorite to win the Nobel Prize for Literature for years.
Translated into fifty languages, his work alternately disenchanted, fantastic, absurd or realistic spans four decades and includes ten novels as well as short stories and essays.
Among his most famous novels are "Chronicles of the spring bird" (1994), "Kafka on the shore" (2002) or "1Q84" (2009).
His short story "Drive my car" was adapted for the cinema and the film won the Oscar for best foreign film in 2022.
His latest novel, "Le Meurtre du Commandeur", was released in 2017 in Japan and the following year in France.
Although his works are extremely popular both in his native country and abroad, Haruki Murakami flees fame and appears only very rarely in public.
Apart from a regular radio show in Japan, which he DJs, he says little about world affairs outside of his books, "because it requires thought and a precise choice of words" according to him.
A library dedicated to the writer, collecting his manuscripts and his discography, was inaugurated in 2021 on the campus of Waseda University in Tokyo.
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