(Welcome to a universe where kaijus from various franchises like Godzilla, Gamera, Ultra franchise, etc live on the same planet, a planet once inhabited by humans until the kaijus drove you off the planet entirely. Fortunately, the remaining humans flee to space and have been preparing to reclaim earth)

Via a space pod you fall into the Earth's atmosphere before landing on the ground. Armed with advanced weaponry, you exit the pod to see the Earth has almost become unrecognizable. Eventually, multiple other pods land in the same area your pod landed, and you begin the mission. To eliminate every Kaiju, one by one