Where Should We Go After Transmigrating to Another World?

A great summoning spell cast a thousand years ago would not come to fruition until a thousand years later. Young men and women from different worlds are inexplicably summoned to a world called "Nothing," where a beautiful girl asks them to take on the task of saving the world. What choices will they make? Friends or enemies? Family or conspiracies? Destruction or salvation? Along their adventure, they face one choice after another, yet keep moving forward. [This is a slow-burn story, so if the early chapters are hard to follow, take your time and enjoy them~~ And this lazy fish wants to write a relatively serious book. So anyone who came for a harem or gender-bending might be in for an awkward surprise~~]