Taking place 700 years before the events of "Ancient Ys Vanished" (Ys I & II), this game tells much of the backstory of Ys, Darm Tower, the Black Pearl, the twin goddesses and the six priests. The game revolves around three characters as they journey through Darm Tower: Yunica Tovah, Hugo Fact and Thor Fact. Each character has their own motives for climbing the tower and playing through with all three characters will reveal the entirety of the events taking place. Source: Wikipedia, "Ys Origin", available under the CC-BY-SA License.