When Mia returns from a certain project for the first time in 26 years, she sees a completely changed Earth, divided into scorching heat and frigid cold, making it impossible for humans to survive. Mia and the AI robot Shirowan land in the twilight zone, the only place where humans can survive, and encounter terrifying creatures on Earth...!? What has become of humans on Earth?One person and one animal move forward on a world that has completely changed!