Kazuma Kodaka is a Japanese manga artist born on November 19, 1969, in Kobe, Japan. She made her professional debut in 1989 with the manga Sessa Takuma! serialized in the magazine Weekly Shōnen Champion. Kodaka is recognized as a pioneer and a top-ranked creator within the Boys Love genre, which focuses on romantic relationships between male characters for a primarily female audience. Her decision to work in this genre stemmed from reading parody manga with yaoi themes, which she found more psychologically complex than typical shōnen or shōjo manga.

Kodaka is the author of a substantial body of manga works. Her notable series include Kizuna: Bonds of Love, Kimera, Border, Ren ai Hōteishiki, Hana to Ryū, Kusatta Kyōshi no Hōteishiki, and Sex Therapist. She also created the series My Sexual Harassment, for which she designed the characters in its original video animation adaptation. In addition to her original serialized work, Kodaka has produced a significant amount of dojinshi, or self-published fan works, based on popular series such as Prince of Tennis, Fullmetal Alchemist, Hikaru no Go, and Slam Dunk.

Kodaka is a self-taught artist who cites Rumiko Takahashi as a design influence and learned shōjo manga techniques from Sanami Matoh, the creator of Fake. She draws entirely by hand, without the use of computers. Her artistic identity is closely tied to the Boys Love genre, and her work has contributed to its development and international recognition. No verifiable information could be found connecting the creator Kazuma to the manga Oniyome Diary based on the available search results.