Marimo Ragawa first started submitting manga to a comic magazine when she was 12 years old. She kept up her submissions for four years, but to no avail. She decided to submit her work to the magazine Hana to Yume, where she received top prize in the monthly manga contest, plus an honorable mention (Kasaku) in the magazine's Big Challenge contest. Her first manga was titled Time Limit. Baby & Me was honored with a Shogakukan Manga Award in 1995 and was spun-off into anime.

Ragawa's work showcases some very cute and expressive line work along with an incredible ability to show complex emotions and relationships. Some of her other works include N.Y. N.Y and the tennis manga Shanimuni-Go.

Ragawa has two brothers and two sisters.