Asebi to Sora Sekai no Boukensha

In a world of islands floating among the clouds, Yuu protects people from enormous, hostile monsters called dragon fish. He serves as a guard, defending citizens and their ships from the creatures’ attacks. Yuu sets out on an adventure with Asebi, a young android. They aim to find the ancient island of Brant, once the capital of the legendary Waldecia archipelago, which preserves many remnants of human civilization from its heyday.