Rodzeństwo Furo

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 human and devil using the Book of Sorcery. *Note: Includes the one-shots "Furou Kyoudai Tokubetsu-hen" and "Kaizoku-hime".*

In the bathtub together, in the restroom together...what is the reason these twins can't be separated even for a moment...? \*Note: there are two versions and long and short version of this title. This is the short version.