Shoeisha Co., Ltd., sometime abbreviated SE, is a computer software publisher specializing in computer books. They have more than 1,000 publications, including programming books and application tutorials.
Formerly, Shoeisha produced titles for various video game consoles, including PlayStation, Dreamcast, and Sega Saturn. 23 titles were produced 1995 through 2001.
Source: Wikipedia, "Shoeisha", available under the CC-BY-SA License.