Is Yondemasu yo, Azazel-san. hentai?
No
Rated R+ (Mild Nudity) on MyAnimeList and not tagged as Hentai.

OVA · 2010 · 4 episodes · R+ - Mild Nudity
Comedy, Gag Humor, Mythology, Seinen, Supernatural
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)
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