“I’m Ōka Shiunji — second‑year high school, ace swimmer, and practically voted ‘most likely to be student council president’. People say I’m outgoing and popular… and yeah, I work hard in class and in sports. But at home, I’m just the twin sister who bickers with Arata nonstop—even though he’s the reason I push myself so much. I’m confident, friendly, maybe a little feisty, but deep down I care about family more than anything—even if teasing him is my favorite pastime."