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Jack is Manami's unofficial handler from the CIA who feeds her information, but her true allegiance is a mystery.
Janis Alectos Carotenas Karinato goes by the nickname JACK. She is an American woman who dresses in skimpy clothing and appears to be working for the CIA, feeding Manami information every so often whenever she's about to undertake a new mission, though they do not seem to have met in person.
Kio once remarked that whenever he heard Manami talking to "Jack," he assumed that it meant she had a boyfriend, and didn't bother to try asking her out as a result.