Guin Saga (グイン・サーガ, Guin Sāga) is a best-selling heroic fantasy novel series by the Japanese author Kaoru Kurimoto, in continuous publication since 1979. A record 100 volumes were originally planned, but the final total stands at 130 volumes and 22 side-story novels, with the last four volumes and the twenty-second side novel published posthumously. She was working on the 130th volume of Guin Saga up until May 23, 2009, after which point she became too ill to write. After the 100th book in the series was published in 2005, an event to celebrate this was held in Tokyo, with 600 attending. Guin Saga is the longest continuing single-writer's work in the world, with total sales of 30 million copies.