Nobuaki's girlfriend who helps him on several occasions.
SpoilerShe had sex with Naoya in order to save Naoya's own life. Nobuaki forced him to do it with Chiemi by beating him up just to not let him die since Naoya kept refusing to do it.
SpoilerShe later dies in Nobuaki's arms making him the only survivor.
SpoilerChiemi is Natsuko sister, she was raised by none other than the one who was part of the first King's Game and the only survivor, her father, Katsunari Honda.
MAL
