Nayuta no Kiseki

Near the "end of the world" lies Remnant Island, one of the islets in the vast Sciencia Seas. Two boys who just returned from their vacation, Nayuta and Signa encountered a small fairy-like girl called Noi from the descended ruins tower nearby. Furthermore, two men named Zechst and Selam appeared before them after Noi's Master Gear, whose powers can control the stars. The Master Gear, the ruins that fell from the skies and the other world "Lost Heaven" within the Star Fragments. To protect the future of the stars, Nayuta Herschel journeys off to the other land "Terra". Source: Fandom