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Michikos rival she knew since she was young. She became a cop and was responsible for Michiko being in Prison for twelve years.
Atsuko lived in the same orphanage as Michiko as a child; she and Michiko were friends, until she got tired of being pulled into Michiko's trouble. Atsuko eventually became a police Sargent; she ultimately became the head officer in charge of Michiko while in prison. When Michiko broke free she lead the charge in bringing her back, even enlisting the help of Satoshi Batista; which eventually caused her to be taken off the case. Atsuko aided Michiko one last time, before breaking all ties with her former friend and, bringing her in for good.