Hana Sunomiya
須ノ宮 ハナ
Tentang
She is a high school student who joined the art club during Senpai's third year as well as an acquaintance of his since middle school and the younger cousin of the former President, with whom she shares a striking physical resemblance and habit of public nudity. She is a kōhai to all of the other characters. (Source: Nagatoro Wiki)