Gekitotsu no Hexennacht

is a Japanese light novel series written by Minoru Kawakami, with illustrations by Satoyasu (TENKY). The series began publication on August 8, 2015 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
This is the earth controlled by the [Black Witch]. Mankind succeeded in sealing the witch who once tried to destroy this world on the moon, but its power still left a scar on this world.

Who will judge the witch sealed on the moon on the night of Hexennacht once every ten years? The girls compete for that position and collide at high speed with their hearts as fuel.

A cannonball breaks the ground. To save the world !!