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. That same evening a young girl appears before Ichika, smirking playfully, and introduces herself as Mafuyu, Manatsu's identical twin. The single OVA episode is a fantasy drama in the magical girl tradition.