Yutsuko Chūsonji, born Yukiko Fujiwara on May 28, 1962, in Yokohama, Kanagawa Prefecture, was a Japanese manga artist, essayist, and commentator. She worked under the pen name Chūsonji Yutsuko, a creative variation of her given name Yukiko. She began drawing manga in elementary school and also worked as a child model before graduating from the faculty of law at Komazawa University. Chūsonji launched her professional manga career in 1987 after winning rookie awards from the magazines Business Jump and Manga Action.

Chūsonji is best known for creating the manga series Sweet Spot, which was serialized in the magazine SPA! from 1989 to 1992. The series is a comedy about an office lady with a passionate interest in golf, set against the backdrop of Japan's bubble economy era. Sweet Spot is credited with originating the Japanese slang term oyaji gal, meaning "old man gal," which describes young businesswomen who adopted the leisure pursuits and interests stereotypically associated with middle-aged businessmen, such as golf, karaoke, and horse betting. The series was published in eight collected volumes by Fusosha Publishing. In 1991, Sweet Spot was adapted into a forty-five-minute original video animation (OVA) directed by Gisaburō Sugii and produced by Fuji TV, Group TAC, and Pony Canyon.

Beyond Sweet Spot, Chūsonji created several other notable manga series. Her 1989 series Ojodan, first published in 1989, sold over 200,000 copies. Her work often addressed themes of business, politics, and contemporary culture, frequently focusing on the experiences of women navigating the bubble era. In the mid-1990s, she moved to New York City, where she wrote the manga series Wild Q, serialized in the men's magazine Popeye. The story follows two Japanese men who travel to Brooklyn to learn about hip-hop culture. The series initially drew criticism from the Japanese hip-hop community for its portrayal of Japanese enthusiasts. In response, Chūsonji adjusted her characterization and helped finance Hip-Hop Night Flight, which became the first successful Japanese hip-hop radio show. In addition to her manga, she worked as an essayist and commentator, wrote for publications such as the Nihon Keizai Shimbun, and provided lyrics for singer Miyazawa Rie.

Yutsuko Chūsonji passed away on January 31, 2005, at the age of forty-two due to complications from colorectal cancer. Her work remains significant for its sharp, comedic, and culturally observant portrayal of a specific generation of Japanese women and its influence on popular slang and social commentary during the late 1980s and early 1990s.