Sosuke Natsukawa is a Japanese physician and novelist, born in Osaka Prefecture in 1978. He graduated from the Shinshu University Medical School and practices medicine at a hospital in the largely rural prefecture of Nagano. His multivolume debut novel, Kamisama no Karute, published in 2009, won several prizes and sold over three million copies in Japan. The Cat Who Saved Books is set to be translated into over twenty languages around the world.