Katsura Kokoro

Kokoro Katsura is the sweet-natured younger sister of Kotonoha. Unlike her older sibling, Kokoro is peppy, talkative and full of curiosity, and although she frequently teases Kotonoha, she worries about her greatly. She has a good friend named Uzuki and affectionately looks up to Makoto as her older brother. Kokoro lives with Kotonoha and their mother Manami and father.