Once upon a time Humans and Demons lived together in the world. Now they live in different dimensions but few demons have entered the human world and trying to kill them. Soul Survivors fight against these demons to seal them away. Kyousuke Akagi is a high school student whose daily life consists of fighting these demons along with his friends Taichi Matsubara, Miyuki Shimizu and Ayana Suzuki. One day on his back from school Kyousuke and Ayana suddenly encounter a powerful demon that opens a dimension to the human world, allowing other demons to enter aswell. Can Kyousuke and Ayana handle these demons?