Koh Akizuki, also known as Kō Akizuki, is a Japanese author best recognized as the original creator of the long-running light novel series Fujimi Orchestra. The author is female and a native of Kanagawa Prefecture in Japan. Beyond her work in the boys' love genre, Akizuki writes under the real name Tatsumiya Shou, a pseudonym under which she is a prolific author of children's literature.

Akizuki is most famous for Fujimi Orchestra, a series that began publication on March 31, 1994, under Kadokawa Shoten's Kadokawa Ruby Bunko imprint, a label known for specializing in boys' love titles. The series, which was still in publication as of the last major updates, centers on the romantic and dramatic relationship between Yuki Morimura, the concertmaster of a small amateur orchestra, and Kei Tonoin, a brilliant and forceful conductor who joins the group. The story explores their complex dynamic, framed by their shared passion for classical music. In addition to this flagship series, Akizuki has authored other novels, including Yatteraneeze! and Tenpera.

The success of Fujimi Orchestra led to multiple adaptations across different media. The first story was adapted into a single sixty-minute original video animation (OVA) titled Cold Front - The Storm After the Rain, which was released on July 22, 1997. The OVA was produced by the studio Anime International Company (AIC) and directed by Atsushi Ōtsuki. Subsequently, the first and fourth stories from the novel series were adapted into a manga, illustrated by Sei Goto, which was published in 2005. A live-action film adaptation, Cold Front Conductor, was released on March 3, 2012, directed by Satoshi Kaneda with a screenplay by Rino Itaya and Shinsuke Hakoda.

As a creator, Akizuki is primarily associated with the boys' love genre. Her work on Fujimi Orchestra helped define a subgenre of romance stories set within professional and competitive artistic environments, such as orchestras. Her artistic identity is tied to creating narratives that combine detailed emotional conflict with the high-stakes world of classical music performance. The enduring popularity of the Fujimi Orchestra series, which spans dozens of volumes and has been adapted into audio dramas, manga, anime, and film, demonstrates Akizuki's significance as a foundational creator in the commercial boys' love market in Japan, proving the viability of light novels as source material for cross-media franchises.