蒼穹のアリアドネ

Lashil, a boy living in isolation, dreams of the legendary flying city in the sky. In a nearby forest, he encounters Leana, a girl with the ability to float, who is being pursued by mechanical soldiers. Leana reveals she is the princess of the Ariadne Empire, the very flying city Lashil admires. Appointed as her “Knight of the Blue Sky,” Lashil joins her quest, facing immediate threats from pursuers in their first town. Their journey begins with battles against photon-wielding foes, launching a fantastical adventure to uncover the secrets of the sky-bound empire. (Unreviewed summary by Grok 3)