A first-year high school student at Yuigaoka (3rd generation). She has mint green hair and pink eyes. Height: 163cm. Blood type: O. Birthday: December 28th. Her personality is perfectionist and cool. She is stiff-necked and not the type to easily acknowledge others. She has an older sister, Natsumi Onitsuka. She commutes from Ushiku to Yuigaoka in Tokyo with her sister Natsumi. She calls Natsumi "Ane-ja." She uses polite language (honorifics) with everyone. She addresses her crush, Margarete, peers, and juniors without honorifics. She addresses seniors as "Senpai." With the person she loves, she drops the act, speaks casually, and acts spoiled.