Witch of Ouka

is a Japanese light novel series written by Konotei Taraku, with illustrations by Mako Yamada. The series began publication on May 10, 2014 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
"Cooperate to bring out the power of the magic book (notebook). Otherwise you will die."

The de S witch with light red hair who calls herself Ouka has accumulated. The black history that everyone has-In the case of me, Shindo Sanemichi, a painful note with the so-called "My thoughts on the way" that I thought about when I was little ... When she became a high school student, her fainting past should have been driven beyond oblivion, but when she suddenly appeared in the present age, she had my notebook for some reason and asked to cooperate to save the witch world.

Does my black history have the power to save the world? That's stupid !? Casting my spell in public ...?!? Stop it! At that time, I thought that my life was zero. But it was different. Because she is--.

This is the story of the bond between a boy with a painful past and a sadistic tyrant witch, connected by a black history note.