Viatrix Upheaval - What's Wrong with the Game I Played Today?

Zuko and Lucien are two 17 years old teenagers with very different backgrounds and lifestyles. Zuko is an orphan living in an orphanage, while Lucien is the son of a technology company CEO. However, one day, while they are meeting, chaos unfolds in the outside world unbeknownst to them. Terrifying monsters emerge, spreading fear and death. In a critical moment, Zuko sees Lucien's body disappearing as if a statue made of chalk was touched by water.

Screams echo around them. There is no hope for help. And suddenly, both of them... wake up in the game they have been playing all along, VIATRIX UPHEAVAL. They are also required to make a contract if they want to stay alive!

What kind of contract is it? What will they do next? As humanity begins to be questioned, what they thought was steadfast turns out to be mere illusion.