In the distant future called the "Echo Era", human civilization has been reduced to ruins, and ancient "Stardust Technology" has become a taboo legend. As the inheritor of the last memory, Ella accidentally awakened the guardian spirit of a ruins - the "Mentor" while avoiding the pursuit of the "Purifier". In order to find the scattered stardust core and prevent the Purifier from erasing all memories of the old world, she embarked on a journey through the Forgotten Land. However, as the truth gradually emerges, Ella finds that her mission is far heavier than she imagined.
