Kuroko Tetsuya's last impression was of the endless sky over the sea, with the distant whistles of fishing boats filling his ears. This is a world beyond his knowledge. Even though he has sneaked out of the sea and looked at it many times without anyone noticing, he is still attracted by the setting sun on the horizon, the seagulls spreading their wings, and the human voices captured by his gifted ears with excellent hearing. He longed to see the land and heard the witches in the sea say that there were grasslands more vast than the sky, churches that were more gorgeous than the palaces under the sea, ice fields, blazing flames, shining weapons and beautiful girls.