Kinsei no Rivere

Kugami Sugara desires nothing more than a quiet, uneventful school life. However, her hopes for tranquility are quickly shattered when she is unexpectedly selected by the beautiful and highly talented Shirasagi Yui to serve as her pseudo-sister. Thrust into an unfamiliar dynamic with one of the school's most prominent students, Sugara finds that her daily routine has become anything but peaceful. The situation grows even more complicated with the sudden involvement of Shirasagi Ui, Yui's identical twin sister. As the capable yet emotionally distant student council president, Ui commands respect throughout the school. When she begins taking a personal interest in Sugara as well, the protagonist is caught squarely between two strikingly different sisters. What was meant to be an ordinary academic experience rapidly transforms into a complex web of attention and unexpected relationships, leaving Sugara to navigate the overwhelming challenges of her new reality.