Saeko

was the wife of the Kawaguchi Metal Fittings Corporation's manager. She was infected by the Human Body Ignition Phenomenon, turning her into a Flame Human.

Appearance
As a Flame Human, Saeko had black, charcoal-like skin with the rest of her body being enveloped in flames, no mouth and solid-colored eyes with black sclera.

Personality
While a Flame Human, Saeko was peculiarly intelligent compared to her kind. Just like the rest, she was driven by rampage and chaos, and burned everything in sight.