Sister Grey is a close friend of Iczer-1, and the creator/mother of Iczer-3. When Iczer-1 sensed Neos was attacking Earth, Sister Grey sent Iczer-3 to Earth in her place.

In deep space a battle wages between the forces of good and evil and the fate of the Earth hangs in the balance. The evil Neos Gold dispatches her invading forces towards Earth with only one aim: the total destruction of all mankind. Now it's up to Iczer 3 (the younger sister of Iczer 1) to defend the Earth from the deadly armada of Neos Gold, with only the Earth's single remaining battle cruiser on her side. But don't count her out; what Iczer 3 lacks in experience she makes up for in all-out enthusiasm.

[Website (WMG)](https://wmg.jp/shimamotosumi/) | [Wiki (JP)](https://ja.wikipedia.org/wiki/%E5%B3%B6%E6%9C%AC%E9%A0%88%E7%BE%8E)

A Japanese actress, voice actress and narrator of film, anime and video games. She is currently independent of any talent management company.

After graduating from the Toho Gakuen College of Drama and Music, she joined Gekidan Seinenza, a theatrical acting troupe. Her best-known voice roles include [Nausicaä](https://anilist.co/character/539/) in [Nausicaä of the Valley of the Wind](https://anilist.co/anime/572/), and [Kyouko Otonashi](https://anilist.co/character/4745/) in [Maison Ikkoku](https://anilist.co/anime/1453/).

She won the role of Nausicaä as she had played [Clarisse](https://anilist.co/character/11236/) in [The Castle of Cagliostro](https://anilist.co/anime/1430/) and impressed Hayao Miyazaki.

She is married to Daisuke Koshikawa, one of the founders of the comedy troupe Chibikko Gang. Their first child, [Shiori Koshikawa](https://anilist.co/staff/185752/Koshikawa-Shiori), has also done voice acting.

(Source: Wikipedia)