Female 18 years old Former executive of the Black Organization's Pharmaceutical Division Currently attends Teitan High School as an ordinary student. She is a tsundere and not particularly sociable. She has experience studying abroad in the United States. She tends to keep her distance from others; the only person she speaks comfortably with is her older sister, Akemi. She likes small animals but seems to dislike reptiles. Having lost her parents, she seems to enjoy just being by her sister's side.

Female 25 years old She has a gentle personality and cherishes her younger sister dearly. Former low-ranking member of the Organization Currently works as an ordinary restaurant waitress. As Shiho's older sister, she is currently Shiho's only guardian since their parents are gone.