Kei is one of the two main protagonists of Dirty Pair, a science fiction action-comedy series. She is a member of the WWWA Trouble Consultants, an elite but notoriously destructive team that is sent to handle dangerous missions across the galaxy. Kei is impulsive, hot-tempered, and physically strong, often rushing into situations with little restraint. Alongside her partner Yuri, she solves cases, battles criminals, and causes massive collateral damage, earning the nickname "Dirty Pair."