Sumiko Kamimura is a Japanese manga artist who began her professional career in 1986. She is best known as the original creator of the manga series 1+2=Paradise, which was later adapted into a two-episode original video animation. Kamimura was born on March 7, 1965, in Tokyo, Japan. Before debuting as a creator in her own right, she worked as an assistant to other established manga artists. Her debut work was Ikenai! Runa-sensei, also known as Dangerous Teacher Luna, which was first published in 1986 in Magazine Special. The success of this initial series led to a sequel, and the property was eventually adapted into multiple live-action videos released in 2014.

Kamimura's most recognized work, 1+2=Paradise, was serialized in Kodansha's Monthly Shonen Magazine. The series ran from 1988 or 1989 to 1990 and was compiled into five volumes. The story is a romantic comedy that follows a teenage boy who develops a fear of women after a childhood incident with twin sisters. The twins later return to live with him, leading to a series of sexually tinged comedic situations. Due to its sexual content, the manga was placed on harmful manga lists by local and national governmental agencies in Japan. The resulting negative publicity led Kodansha to discontinue the series. It was later re-released in its complete form by the publisher Shobunkan from 1994 to 1995.

The manga was adapted into a two-part OVA produced by the studio J.C. Staff and released by Toei Video in 1990. The first OVA episode was released on February 23, 1990, and the second on April 27, 1990. Each episode has a runtime of approximately thirty minutes. The adaptation was directed by Junichi Watanabe, with a screenplay by Nobuaki Kishima. Despite the erotic nature of the source material, contemporary reviews noted that Kamimura, as a female creator, had managed to attract a loyal fan base among women as well as men.

Kamimura's artistic identity is rooted in the erotic comedy genre, specifically creating works for a male shonen demographic. Her series typically blend slapstick humor and romantic misunderstandings with risqué situations. Her career began in the mid-1980s, a period when explicit content in manga was a notable point of public debate, and her work became part of that controversy. While she was active primarily in the late 1980s and 1990s, with less frequent publications after 2000, her significance lies in her role as a female author who successfully navigated and contributed to a male-dominated genre during a particularly volatile period for manga censorship. The notoriety of 1+2=Paradise serves as a case study for the regulatory pressures faced by manga publishers in Japan at the end of the twentieth century.