1 and 2 are siblings who live in the vast kingdom of White Land, a universe that is entirely blank. One day, the duo receives a letter from the Prince demanding that 1 marry him. Unwilling to comply, they use a school field trip as an opportunity to escape White Land. They will meet many strange individuals who will try to stop them and soon learn the truth about the Prince's intentions and the entirety of White Land.
Warning: This is going to get really bizarre.