Promise of the Blue Castle's Fish and Girl

In the deep blue underwater world, amid the ruins of an ancient castle, a black-haired girl encounters a small blue fish. She chases bubbles on the surface, gently approaching her lips to the fish, as if whispering secrets of a lost kingdom. In this moment, a sense of adventure sprouts in the girl's heart. The castle towers bathe in light, and the distant sound of waves guides them to a new story. Why not immerse yourself in this dreamlike world?