Japanese cozy fiction, often involving quiet musings and conversations unfolding inside bookstores and coffee shops, is currently the country’s biggest literary trend captivating the West. A decade ago, that soft cultural power belonged to books and shows about the Japanese way of tidying up.

“Whispering Rooms,” published this spring in English translation by Cathy Hirano, blends both in a novel co-authored by Marie Kondo and Genki Kawamura.

Whispering Rooms, by Genki Kawamura and Marie Kondo. Translated by Cathy Hirano. 215 pages. BONNIER BOOKS, fiction.