Born in Osaka Prefecture in 1964 and raised in Hiroshima Prefecture. She moved to Tokyo after her high school graduation. At the age of 30, she decided to become a manga artist. With her first manga Kaoru no Hiwa (The Secret Stories of Kaoru) she won the 27th Chiba Tetsuya Manga Award, and made her debut with Morning in 1995. Following this, she released manga in a broad range of styles and media, including Himitsu no Hanazono Kessha Risupekutaa (The Secret Hanazono Association Respecter), Mahotsukai Mimicchi (Wizard Mimicchi), and Aiwa Nami no Inu (Nami Aiwa's Dog). Her manga Akai Bunka Jutaku no Hatsuko (Hatsuko From the Red Culture House) was adapted for the screen by TANADA Yuki as a live-action film in 2007. Mamagoto was chosen as a Jury Selection in the 15th and 16th Japan Media Arts Festivals, and won an Excellence Award in the 42nd Japan Cartoonists Association Awards.