Chiyo is Kuroko Koumori's main love interest and the daughter of infamous yakuza boss Tesshin Yanaoka. She is a talented swordswoman who puts an emphasis on being able to defend herself. Though she seems rather ambivalent towards Kuroko, openly scolding her and being perturbed by her lascivious personality, Chiyo genuinely cares about her, the two might have the possibility of having an "open" relationship—although their relationship isn't confirmed, yet there's signs that this is true.