A high school senior and president of the school's kendo club, she is extremely skilled with a bokken and close combat. Calm and collected with a sense of pride in her skills and those that she's with, Saeko is among the most reliable of the group. Everyone can count on her skills to pull them through if need be. Not much is known about her family except for her father who had traveled abroad on a self-defense conference before the advent of the Outbreak. She has shown fondness/crush towards Takashi and believes in his abilities to get them to safety. Saeko admits to Takashi that she is secretly a sadist who enjoys inflicting pain on those weaker than her, which is why she derives so much pleasure from killing "them". She describes herself as being the one person whose true nature hasn't been changed by the apocalypse but Takashi insists she is a valuable member of the group. She also inadvertently drools when she sleeps.