Itsuki, a young girl, encountered a captivating boy residing in a castle atop a mountain during her childhood. This boy became her refuge after her parents abandoned her with her step-siblings. However, one day he disappeared. Now burdened with the responsibilities that her parents should have shouldered, Itsuki yearns for someone to care for her instead. Unexpectedly the boy from her past reappears and rescues her from a near-fatal incident. Yet he behaves strangely, deviating from Itsuki's previous perception of him. She wonders about his intentions are and what he desires from her.