Yosano Akiko is a member and personal physician of the Armed Detective Agency. Her ability is a rare healing ability, Thou Shalt Not Die. Yosano is a young woman who takes care of her appearance. She has straight, dark hair cut into a bob that reaches past her chin and bangs. Her eyes are magenta. Yosano has a rare ability among ability users, Thou Shalt Not Die, which allows her to heal all external wounds as long as they are fatal or the person must be "half-dead".