Makiko Hayashi is introduced as Alexander Mayhew's personal bodyguard. After witnessing Mayhew's corpse after an attack on his estate, Kiko aids James Bond in infiltrating the Phoenix Building in Tokyo, only to be captured.
She's next seen on Raphael Drake's nuclear power plant waiting for Bond. After aiding in his escape, Kiko shoots Bond with a tranquilizer dart, and hands him over to Drake, double-crossing Bond. During this encounter, Kiko kills Dominique Paradis by kicking her off the Phoenix Building's rooftop.
Kiko encounters Bond one last time in Drake's rocket launch site. Bond fends off Kiko's guards, and manages to trap her inside the launch silo, leading to her death when a spacecraft's engine burns her to death.
She's a playable character in the game's multiplayer mode.