Ko Miyazaki is a forward from Tokyo. He played youth football with Mitsubishi Yowa and Maebashi Ikuei High School before attending Komazawa University. Tochigi SC signed him for the 2022 season, and he became a regular forward over three J2 League campaigns. After Tochigi were relegated, Miyazaki transferred to Vegalta Sendai for 2025, giving Sendai a tall attacking option with J2 scoring experience.