Ao to Kuro no Kyoukai-sen (Volume)

is the first volume of the Ao to Kuro no Kyoukai-sen light novel series, written by Mizuki Kuraku and Illustrated by Maruino. It was released under the Dengeki Bunko Imprint in November 2013.

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 star they live in "a world where it doesn't rain". It's been about 100 years since then. There was a girl called "Ame-Onna" as a witch who robbed the world of rain. And there is one young man who pursues her as her destined 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.

(source: Bookwalker JP - Translated)