Rinka Aiba is a tall, charming girl with the perfect “prince-like” appearance—an exceptional athlete, intelligent, and famous as one half of the legendary duo “The Sacrosanct.” —yet behind her cool, elegant, and trustworthy exterior, she is a sensitive soul who pays close attention to detail, craves affection, and possesses the ability to accurately read others. Ultimately, she falls in love with Yotsuba Hazama for his genuine simplicity and honesty, and later, alongside Yuna Momose, forms a unique and complex romantic relationship with Yotsuba through a mutually trusting two-timing arrangement.