Girl in Blue (蒼の少女, Ao no Shoujo) is the first episode of Granblue Fantasy The Animation.
Plot
A boy named Gran lives on the island of Zinkenstill. He has dreams of flying to the great sky and works hard every day.
One day, a roaring sound echoes through the peaceful island. A Warship arrives from the light in the sky. Gran goes to follow it and meets a strange girl named Lyria. For some reason, she's being pursued by the Erste Empire.
To protect Lyria and his home, Gran joins the Knight Katalina.