SNOS-248 Newcomer No. 1 Style: A pure and innocent older sister who is dedicated to swimming, Sonoko Rion, makes her AV debut. - Rion Sono

Your sister is pure. She started swimming at the age of 4, competed in the Junior Olympics in middle school, and was a national team athlete in high school. Of course, she entered university on a swimming scholarship. She lived a smooth and successful life as a sporty girl, but one day she got injured during practice, and her athletic career ended that day, experiencing her first setback. She gave up her dream of becoming a professional swimmer halfway through. With a lingering feeling that she couldn't give up completely, she works every day as a swimming instructor.