Claim: Magazine Special, a Tokyo-based monthly Shōnen B5 format manga, was first published by Kodansha on September 5, 1983 in Japan.
Evidence: Magazine Special (マガジンSPECIAL) was a Japanese shōnen manga magazine published by Kodansha and first launched with a cover date of September 5, 1983. It is issued monthly on the 20th in perfect-bound B5 format and retails for 540 yen.