Kanoko Saimori

Miyo's stepmother and Kaya's biological mother. She harbors a deep hatred for Sumi, Miyo's late mother and her rival for Shinichi Saimori's affection, and blames Miyo, Sumi's child, for any inconvenience that occurs around her. She raised her biological daughter Kaya to compete with Miyo, constantly telling her to surpass Miyo in every aspect.

Although she meets her downfall and exits the story at the end of Volume 1, she never changes her victim mentality, believing that their ruin was caused by Miyo's defiance and pursuit of happiness against her wishes.