よんでますよ、アザゼルさん。
Yondemasu yo, Azazel-san.
OVA R+ HD Sub 4 4 eps
The great detective Akutabe has an assistant, Rinko Sakuma, who is trying to learn to summon demons. This is the story of her misadventure when she actually manages to summon 2 demons unexpectedly. (Source: ANN)