A planet called "Devil's Star" has appeared out of nowhere, causing the plants and animals on Earth to mutate into monsters that are capable of annihilating humanity. Just when humanity is on the brink of extinction, humanity has found out a way to log in into Devil's Star, and found out that they are able to obtain powers from Devil's Star to fight against the monsters. Hence, humanity has stepped into the era of venturing Devil's Star in order to survive......