Synopsis: Kitsune no Akuma to Kuroi Madousho

The story follows Kyuuki, a powerful and confident fox demon who awakens to find that she requires a host. Enter Kamishiro Shin, an average high schooler who possesses a unique talent and has accidentally gained control over Kyuuki's fate through a mysterious black Grimoire. Unfortunately for Shin, he is permanently linked to the book, meaning he cannot cut ties with Kyuuki. What's more, those coveting the Grimoire's power will stop at nothing to claim it, putting Shin in constant danger no matter where or when he goes.