Unknown no Madousho

Unfortunate accidents and strange occurrences are mostly devils' work. People might not realize this, but the world is full of devils. Professor Sakakibara and the devil Unknown solve cases between humans and devils using the Book of Sorcery. *Notes: - Began as a one-shot published in the 2011 No. 23 issue of Hana to Yume on November 5, 2011. After it switched to a series in the 2012 No. 2 issue on December 20, 2012, the one-shot retroactively became "chapter 1". - Volume includes the one-shots "Furou Kyoudai Tokubetsu-hen" and "Kaizoku-hime".*