リオナ

"Natsuki, I think that’s going too far…" She is one of the twins under Karen’s care and Natsuki’s older sister. Quiet and shy, she is the type who keeps to herself and loves reading books. Although she may appear absent-minded at first glance, she is actually thoughtful and perceptive, often acting as the one who keeps Natsuki’s impulsive behavior in check. She looks up to Karen and adores her like an older sister.