Sister Ren lost her parents during her ● school years and has since raised her younger sister, Yua, on her own. Yua has always cherished her older sister, but as she enters adolescence, she begins to develop unfamiliar, intense feelings she can't fully understand. When Ren suffers a heartbreak, Yua seizes the moment to honestly confess her emotions, rapidly deepening their relationship. Ren accepts these feelings, drawing the two sisters even closer together.