Jiro Matsumoto (Japanese name: 松本次郎) is a Japanese manga artist most known for his work on Freesia. Much of his manga is explicit in nature, frequently containing copious amounts of sex and violence. His debut work, story called "Little Feet", was a quasi-winner in '92's Tetsuya Chiba Prize.
He has a transgender sister, who's also a mangaka, Matsumoto Taro.