It's been about 3 and a half year since the first Mount Ether eruptsion leaving Asa with nothing more than clothes and a cloak on her body, and a wooden training sword. Unbeknownst to her, the Hero from another world may have a few connections with the strange occurences in their world. Her past, her family, her origin, and the secrets of their world's end will soon be revealed no matter what her response would be. Alongside Risa, the amateur enchantress who believes the Observer power inside of Asa, they travel across the White Sand Islands to find answers on their even more frequent unnatural world transformation, and to find the truth of the Observer and the Hero.