Toshikazu Kawaguchi (川口 俊和; born 3 April 1971) is a Japanese author, screenwriter, and director born in Osaka, Japan. He has received the Grand Prize of the Suginami Theatre Festival for his stage version of Before the Coffee Gets Cold as well as having been nominated for the Bookseller's Award for the novel version. The novel has been translated into 46 languages, selling over six million copies. He has produced, directed, and wrote for theatrical group Sonic Snail. His works explore themes of love, loss, grief, and kindness.
Source: “Toshikazu Kawaguchi”, English Wikipedia (CC BY-SA 4.0), excerpt