Yondemasu yo, Azazel-san.

The story revolves around the detective Akutabe, his assistant Rinko Sakuma, and the various magical demons that Akutabe uses for his cases.

Note: The first volume was bundled with the limited edition box version of the 4th manga volume called "Ox Box" on 22.02.2010.

The second, third and fourth volumes were bundled with the limited editions of the 5th, 8th and 11th manga volumes respectively.