Ao to Kuro no Kyoukai-sen

is a Japanese light novel series written by Mizuki Kuraku, with illustrations by Maruino. The series began publication on November 9, 2013 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
The 81st day of the 1993 calendar.

The world was covered with black smoke screens in a large-scale explosion in the industrial city of Noir. Since then, rainfall has dropped sharply. People come to call the stars they live in "a world without rain." It's been about 100 years since then. There was a girl called "Ameonna" as a witch who robbed the world of rain. And there is one young man who pursues her as a fateful partner. He was "Haruo".

The story begins when two people, who should be incompatible, meet. A sad and fantastic adventure drama of two people who change the world.