Without any previous indication, all the televisions, smartphones, and radios start broadcasting a message recorded by the government leaders of the world. In it, they explain a horrible tragedy that is about to befall us. Our earth will blend with what is considered to be the primary dimension after having been apart for an unknown amount of time. The merger will not only affect the world, but also the beings on it, and humanity must mingle with other species or die out. Everybody will need to determine the other-dimensional race to pick. The world leaders have known of this for many years and have tried preparing people by creating popular fiction, games, and movies. These are nothing more than tutorials of what is about to happen.