A girl wakes in a hospital room with no memory of how she arrived. Yuuko carries fragments of her past like scattered puzzle pieces: a name, a face, a feeling of loss she cannot quite grasp. When a young man named Hiro appears at her bedside, he claims to know her, to share her burden of forgotten moments. Their connection feels real yet impossible, suspended between what was and what might be. As Yuuko pieces together glimpses of her story, the truth behind her amnesia unfolds in layers. Hiro's presence draws out buried emotions, and she begins to wonder whether recovering her memories means losing something precious in the present. The prologue sets the stage for a narrative built on fragments: incomplete recollections, fractured relationships, and the question of whether some things are better left forgotten. This opening establishes the emotional core of a story where love and mystery intertwine, where characters are defined not by what they remember, but by what they choose to hold onto.