三石琴乃
is originally introduced as a news anchor for local television who had moved from morning television to evening news. Conan discovers that she has been going under the alias in the Black Organization. In the story where the Black Organization tries to assassinate an upcoming politician, she is tasked to interview the politician at the park where the others can shoot him from afar, but Conan thwarts the attempt. She and Vermouth then try to stage an accident so that the politician will step out of his car and get shot, but she ends up getting in an accident instead of Vermouth, and is secretly hospitalized under the watch of the FBI. The FBI determines that the Rena Mizunashi name is an alias as it is a pun on 007. Her real name is . She is later revealed to be a double agent working within the Black Organization and reporting to the CIA. The FBI manages to place Hidemi back into the Black Organization so she can continue to spy on them. But to prove her loyalty to the Black Organization, Hidemi is ordered to kill Shuichi Akai. Though under heavy surveillance, she reports information to Jodie Starling. Her Japanese voice actress is Kotono Mitsuishi and her English voice actress is Jennifer Losi.