An 18-year-old Japanese high-school student with blue eyes & straight & shiny thigh-length purple hair with a triangular fringe which barely touches the ridge of her nose. Saeko is 5' 8.5, 56 kg (123 lbs) & her 3 sizes are B:32.7/W:22/H:34. Her limbs are relatively long limbs & her lips have a shiny pink appearance.

Saeko wears a her school uniform: A white long-sleeved sailor shirt with a green collar & black ribbon. She also wears a knee-length green pleated skirt, black socks & black shoes.

Saeko is shown to be very kind, caring, strong, reliable, & calm & collected, almost never freaking out or losing her cool to an almost frightening degree. She acts as something of a big sister, often considering the feelings of others. Saeko in-line with her familial samurai lineage, strictly follows a Bushido code; her character, behavioral patterns, & frequent sayings (e.g "it's a man's decision after all") provides evidence of her strict following of this. She is the captain of the schools Kendo Club.

Saeko secretly harbours sadistic tendencies, her existential conflict manifests itself by cloaking her troubled. sadistic, malevolent, & violent nature with the facade of a well-mannered & cultured young woman. Her sadistic tendencies manifested when she fought off a would-be molester when she was 14. At first, it was self-defense, but soon she realized that she enjoyed causing pain & having control over somebody's life. Ever since then, Saeko has grown to see herself as someone unworthy of love & even becomes something of a "death seeker". Despite her sadistic tendencies, Saeko does still have morals & shows some self-hatred.