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She lost her license in Japan before Delphi gave her a new name and had her work to help those they infected with GUILT that they wanted to use for further tests.
After Delphi is found and eliminated, she offers samples of immature GUILT viruses to work for Caduceus Europe in exchange for her freedom. Eventually, her real name in the North American version is revealed to be Naomi Kimishima.
In Trauma Team Naomi retires from Surgery when Derek Stiles diagnosed her with an uncurible disease some time in between Second Opinion and Trauma Team.