In 1925, a publisher called of Osaka was established with a branch in Tokyo. In 1948, the Tokyo branch of Sogensha spun off into a separate company with the same name, Sogensha. In 1954, Sogensha was formally reorganized into Tokyo Sogensha. Between 1962 and 1970, Tokyo Sogensha changed its name to due to its reconstruction from bankruptcy. Both Tokyo Sogensha Co., Ltd. and Sogensha Inc. exist as unrelated publishing companies. In 2013, the official mascot cat named Kurari was released. Kurari's name is from Japanese kanji so of Sogensha. So can be divided to kanji kura and katakana ri.
Imprints
（Sogen Mystery Bunko） - Started in 1959, it is one of the leading Bunkobon labels focusing on mystery, science fiction, fantasy, and horror. The label had specialized in translation until 1984 when it entered the field of Japanese works.
Sogen Library - Started in 1995
Mysteries! - Started in 2003
Mystery
Science Fiction
As a science fiction publisher, Tokyo Sogensha began with the translation of Fredric Brown's works as a division of Sōgen Suiri Bunko in 1963. The division and its continuation, which was renamed as in 1991, are Japan's oldest existing Sci-Fi bunkobon label. It published 677 books as of 2015 including the works of Arthur C. Clarke, Isaac Asimov, Robert A. Heinlein, Ray Bradbury, J. G. Ballard, Philip K. Dick, Lois McMaster Bujold, Vernor Vinge, James P. Hogan, Kim Stanley Robinson, Robert Charles Wilson, and Greg Egan. It scored early success in the post-war period with the Barsoom books of Edgar Rice Burroughs and the words of E. E. Smith. Sogen SF Bunko had specialized in translation until 2007 when it entered the field of Japanese works. The first Japanese titles were reprints of Legend of Galactic Heroes #1 by Yoshiki Tanaka and Babylonia Wave by Akira Hori.
Recognition
Tokyo Sogensha won the Seiun Award for Best Translated Novel for 17 works out of 48 times ; the Nihon SF Taisho Award in 2012 and 2013 for Japanese Works.
Tokyo Sogensha awards some prizes for unpublished Japanese works to recruit new writers of specific genres:
Ayukawa Tetsuya Award - Since 1990. An annual contest for mystery fiction, named after Tetsuya Ayukawa, a notable novelist of the genre.
Mysteries! Prize for New Writers - Since 2004. The short story counterpart of the Tetsuya Ayukawa Award, named after the bimonthly magazine the company has published. It was the continuation of the Sogen Suiri Prize for New Writers.
