Strange news reaches the ears of Yuri Amakubo, the scientist behind the ExS-TIA system. On a remote island in the middle of nowhere was a woman who was the spitting image of her older sister Kaede. To uncover the truth, Yuri immediately heads to the island with Souma. There, they find Kaede—who remembers her name, but has lost all other memories. Surprisingly, she and Yuri possess identical pendants... Could this be the key to unlocking her past?