Twin sisters... Separated by fate... Drawn together by a horrific illness...Kasumi and her sister, Shizuku, were infected with the Medusa virus, which slowly turns the victim to stone--and there is no cure! Hope for salvation rests in Kasumi and a select few who are put into a cryogenically frozen state until a cure is found. But Shizuku is left behind, and in the not-too-distant future, Kasumi awakens to find herself in an unfamiliar world with terrifying beings roaming the terrain.Resolving to unlock the mysteries of the disease and the fate of her twin sister, Kasumi struggles to survive in this treacherous world!