別冊少年マガジン
is a Japanese privately-held publishing company headquartered in Bunkyō, Tokyo. Kodansha is the largest Japanese publishing company, and it produces the manga magazines "Nakayoshi", "Afternoon", "Evening", "Weekly Shōnen Magazine and "Bessatsu Shōnen Magazine"," as well as the more literary magazines "Gunzō", "Shūkan Gendai", and the Japanese dictionary "Nihongo Daijiten". Kodansha was founded by Seiji Noma in 1909, and members of his family continue as its owners either directly or through the Noma Cultural Foundation.