This planet is covered by oceans. Humanity lives suspended in the air, and every time a boy comes of age, all children will take a fishing test. Those with excellent aptitude may become great anglers. In the endless ocean, every life is given a sacred mission. There are fish that can fly and burrow, turtles that have absorbed the essence of heaven and earth, whales that swallow the heavens and earth... and countless anglers. Angling is a skill. There's an old saying here: If you're not fishing, you're on your way to fishing.