In a world where humanity has been pushed into a corner of the globe after the invasion of a robot army called the Krix. The brave men and women who sacrifice their lives to protect the survivors of humanity are known as Zo'ans. In the city of Vi, Dante and his classmates have just graduated from the Academy. Without the chance to say goodbye to one another, they are separated and sent beyond the wall with one objective in mind. Become Zo'an.