Kodansha

Kodansha Ltd. (株式会社講談社 Kabushiki-gaisha Kōdansha) is a Japanese publishing company headquartered in Bunkyō, Tokyo, Japan. Kodansha is the largest Japanese publishing company, and it produces the manga magazines Nakayoshi, Afternoon, Evening, and Weekly Shonen Magazine, as well as more literary magazines such as Gunzō, Shūkan Gendai, and the Japanese dictionary Nihongo Daijiten. Source: Wikipedia.