This is a strange sort of romantic story about a lonesome teenage girl named Ririchiyo Shirakiin. She has decided to move into an exclusive apartment complex called Maison de Ayakashi where she hopes to cure her bad habit, where she puts up a bold front and verbally abuses people for no reason, and to learn to interact better with people.
The viewer quickly learns that Maison de Ayakashi is special beyond its residents simply being wealthy. They share a commonality in their ancestry, they are all descended from unions between humans and monsters. This results in them possessing special supernatural powers. Each resident is paired up with a special secret service agent who is also the progeny of human monster unions.
The supernatural aspect really does little to influence the main story and it probably would have worked as well without it. I think that it serves the purpose of mitigating the pedophilia aspect by making Ririchiyo abnormally strong. This series comes from Japan where they obviously have a much more liberal attitude to pedophilia than we in the West. If this is a severe problem for you then stay away from Inu Boku Secret Service.
Our protagonist is paired up with secret service agent Soushi Miketsukami a young male adult. Most of the series follows the evolving relationship between these two and explorations of their pasts.
My initial impressions of the first episode were not good. It was pretty flat story between listening to the whining excuses of a spoil t obnoxious self centered brat and the apparently unjustified adoration of a strange adult man for her, it was somewhere between nauseating and disturbing. In the following episodes things gradually pick up and by the middle of the series it is actually quite good. Episode eleven is the best and the stories climaxes in episode twelve. Episode thirteen just seemed like it was tacked on the end as a comedic after thought.
The supporting characters vary from the eccentric to the absurd. Many of them are the usual stereotypes. I particularly liked Kagerou Syoukiin and his S and M routine. Most of them grow on you. Watching Ririchiyo, who possess supernatural powers, agonizing over and messing up trivial things like inviting another to tea is very amusing. Soushi Miketsukami fills out well, I would not say I ended up liking him but he has an interesting persona.