Holy Valkyrie ExS-TIA F Parallel Episode 2: Reunion

Years after the battle with Naiolo ended, strange news has reach Amakubo Yuri, the developer of ExS-TIA System. It's about someone who looks like Amakubo Kaede, her older sister whom she once fought and suppose to be dead, has been seen on a remote island. To ensure the truth, Yuri contacting Souma and depart together to the island immediately! Story about Yuri, ExS-TIA heroine who doesn't has a single side episode, has been made. Story of Yuri and Kaede that more or less has been conclude in ExS-Tia 3 but you want to see more, also enjoyable to be played as the sequel to the original works. [Translated from official site]

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?