A ghost returns as her own opposite twin, and the show knows the difference between them means everything. Winter erases Manatsu from everyone's memory except Ichika, who has to decide whether to let her go or chase her back through a mirror that keeps swallowing pieces of the person she was. The OVA moves so quietly you almost miss that it's breaking your heart until the final mirror shatters.
Winter settles over Kamakura, bringing with it an unexpected mystery. When Satsuki claims to have spotted Manatsu, Ichika dismisses it as impossible. But the night before her fifteenth birthday, something shifts. A mirror fragment tied to Manatsu vanishes from Ichika's drawer without explanation, and in its place comes a visitor: a girl who introduces herself as Mafuyu, Manatsu's identical twin, grinning with an unsettling knowledge of secrets only Ichika should know. What begins as confusion quickly spirals into something stranger. Mafuyu's arrival disrupts the fragile balance Ichika had built after Manatsu's disappearance, forcing her to confront questions she thought were buried. The boundary between the magical world and ordinary life blurs as winter deepens, and Ichika must decide whether this girl is a gift or a threat. Every interaction carries weight, every smile hides layers of meaning. The story moves at an introspective pace, dwelling in quiet moments that carry emotional weight, blending the wistful tone of mahou shoujo with the heavier atmosphere of loss and reunion.