Ryū Mitsuse (光瀬龍 Mitsuse Ryū, March 18, 1928 - July 7, 1999) was a Japanese novelist, science fiction writer, alternate history writer, historical novelist, and essayist. Mitsuse is the author of Hyakuoku no Hiru to Sen'oku no Yoru. Among his various works, this SF novel is considered as his representative work.[1] Mitsuse is a founder member and was a member of the SFWJ (Science Fiction and Fantasy Writers of Japan). In the West he might be best known for manga-related works and the story The Sunset, 2217 A.D. which appeared in Frederik Pohl's "Best Science Fiction for 1972".