This is a set of 4 SF masterpieces published between 1977 and 1985. Romantic SF Masterpieces, edited by Arihisa Toyoda, Shueisha Bunko Cobalt Series, December 20, 1977, 5th edition Humorous SF Masterpieces, edited by Arihisa Toyoda, Shueisha Bunko Cobalt Series, August 20, 1977, 1st edition World Humorous SF Masterpieces 2, edited by Hisashi Asakura, Kodansha Bunko, April 15, 1980, 1st edition Time Travel SF Masterpieces, edited by Kei Hoshi, Shueisha Bunko Cobalt Series, June 15, 1985, 1st edition These are old books from over 40 years ago, so there is some staining and soiling due to aging. Please check the images. #SF #SF_Bunko #Shueisha_Bunko #Kodansha_Bunko #Cobalt_Series #Masterpieces