Elimona is a seductive devil who runs a store on the border, where Bichura and Kucabara live. She frequently cosplays and tries to seduce Bichura and Kucabara, much to their chagrin. However, she is often turned to for help or advice by the protagonists.

A high school senior and president of the school's kendo club, she is extremely skilled at close combat with a bokken. Calm and collected with a sense of pride in her skills, Saeko is among the most reliable of the group. Everyone can count on her combat skills to pull them through a crisis. Also throughout the journey, she begins to develop romantic feelings for Takashi. 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. Saya's father, Souichirou Takagi, tells Saeko that her father once gave him guidance so to repay the favor, he gives her a very powerful sword, crafted in the Tokyo armory by General Murata during the Meiji Era.

Saeko Busujima