Winter had set in Kamakura and Satsuki informed Ichika about the sighting of Manatsu. Ichika was skeptical about it. But, on the day before her fifteenth birthday, she found the mirror fragment of Manatsu missing from her desk. As night drew nearer, a mischievous-looking girl introduced herself as "Mafuyu," claiming to be Manatsu's doppelganger, and met Ichika.