Rintaro Hamaguchi (born 1979) is a Japanese novelist whose works span mystery, coming-of-age fiction, and family drama. After working in publishing, he made his debut as a writer and has become known for stories that portray the emotions and relationships of ordinary people with warmth and sensitivity. Several of his works have been adapted for film and television. His best-known work, "22 Years Later: I Am the Murderer" ("22-nenme no Kokuhaku: Watashi ga Satsujinhan desu"), is the novelization of the acclaimed Japanese film, combining psychological suspense with a story built around the statute of limitations for murder.
