Kodaka made her debut in 1989 in the magazine Weekly Shōnen Champion with Sessa Takuma!.
[1] She mainly writes manga in the Boys Love genre, featuring homosexual relationships between men for women, and has been described as "a pioneer and top-ranked artist" in the genre.
[1] She has also written many dojinshi which are famous, but difficult to obtain,[3] from the series Prince of Tennis, Fullmetal Alchemist, Hikaru no Go, Gankutsuou: The Count of Monte Cristo and Slam Dunk.
She taught herself how to draw, but one of her design influences is Rumiko Takahashi.
[1] She draws by hand, not using computers, and learned shōjo manga techniques from Sanami Matoh, author of Fake.