In a barren world where water is scarce, a group of young girls with unusual powers, along with a tree intertwined with a railcar, fight for survival. Their existence is forever altered when an amnesiac boy named Wakaba joins them. Together, they embark on a dangerous expedition through crimson fog-covered seas to distant islands infested with robotic insects in search of sustenance. Their journey's success hinges on their resilience and Wakaba's unique ability to comprehend the enigmatic Kemurikusa leaves, the only remnants of life in this desolate realm. Amidst abandoned structures and unanswered mysteries, the truth lies within the Kemurikusa, a key to their survival and the land's past.