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When being in first grade of high school she saw by chance the cover of an issue of anime magazine Animage, which was drawn by Yasuhiko Yoshikazu. Impressed by that she made it her aim to work for the animation industry. She joined Kaname Productions in January 1983. There she was being influenced by Yoshinori Kanada and Mutsumi Inomata. In 1988 uppon Kaname Pro going out of business she became freelancer. Ishida has also dome illustration work for several adult games under the name of Mariko Ijuuin.
She co-founded Studio G-1 Neo together with her ex-husband Masami Obari.
After 2000 she changed her line of work to mostly writing manga.
