The land has fallen into ruin, and children represent the last hope for humanity. One of them, Hiro, fails to live up to that purpose and decides to walk away from it all.... until he meets a girl with horns.

Soon after Goro becomes keenly aware of his feelings, he is put in a perilous situation. How will he and Ichigo respond in this do-or-die scenario?

There appears to be no escape from the impending destruction of Earth. But at the end of the world, Zero Two decides that she will keep her promise, no matter what.