Remnant Island sits at the center of the Ciencia Sea, and shooting stars have been falling on it for years. The Star Fragments they leave behind, lit in a specific way, reveal the outline of a hidden world called Lost Heaven. Nayuta Herschel is a young researcher who believes something extraordinary exists beyond the edges of the known world. Home for the summer, he and childhood friend Cygna Alhazen are drawn into Lost Heaven by the fairy Noi and find themselves caught in a struggle to prevent a madman from destroying it — a destruction that would not stay contained to the other world.