Sora and Shiro are brother and sister. They are hikikomori, they don’t work or study anywhere, but they have become famous throughout the Internet for their skill in games. Once in Disboard - a world where everything is decided through games - they became the rulers of humanity and planned to unite all races and challenge the One God. Having still not found a way to win the game of the Siren Queen, the brother and sister go to the city of the winged ones, Avant Heim, for information! Will they be able to find a common language with a race created for war with the gods themselves?

They have to conquer both the sea and the skies, conquering three nations in one fell swoop!