Kokoro Katsura

Kokoro Katsura is a 11 Year old 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