Good Morning,
Here we are again to talk about another harem series I loved recently (both anime and manga), created by Milan Matra (a famous H-mangaka 
), named "Omamori Himari".
Let's go see the synopsys right away :
Seven years ago, Yuto Amakawa's parents died in a car accident, leaving him alone without a single relative, the only item left of his family being a strange and mysterious amulet given to him by his late grandmother. Ever since then, his childhood friend Rinko Kuzaki (and her parents) has woken him up, cooked for him, and generally takes care of him. His life takes a drastic turn on his 16th birthday when he meets Himari—a cat spirit samurai girl. Himari reveals to him that his ancestors was one of the twelve Demon Slayer families that had slain demons since feudal times, and that she has sworn an oath to protect Yuto from the demons that are out to kill him. However, there is one major problem: Yuto is allergic to cats!
Yes, it reeks of generic harem story and it actually is. There is not much to think about the story, as it takes anyway a minor role in both anime/manga, but the focus is on the girls of course and on the various funny moments the protagonist found into with them.
The characters are quite predictable, but nevertheless very funny to watch. (the protagonist is a little annoying thought)
I did not see much character improvement till now, but hoping in the future with the increasing of the risks due battles.
The manga follows the anime till a certain point (the encounter with Tama) then diverge to reach its own ending (still 7 volumes, but no ending foreseeable).
Let's go watch the manga covers too...
The quality of the covers is quite good (nothing exceptional thought), and the same style/quality remains for the whole manga quite consistently.
The level of fanservice is the same between manga and anime (that is over nine-thousand!!!) and that's a good thing as I'm reading that manga just for that.
Concluding, this series is suggested to anyone looking for a simple and predictable story followed by tons of girls with problems to keep their clothes on. 
That's all for this review,
feal87