Sisters "Ayumi" and "Nanase" have always been inseparable since childhood. However, after a certain incident, their relationship begins to change. Ayumi starts seeing Nanase not just as a sister, but as a woman she deeply loves. Troubled by Nanase's uncertain outlook on the future, Ayumi decides to leave home for college, deliberately creating distance between them. Yet this separation only intensifies the profound emotions growing between the two.