(Currently on chapter 53 on the date of 8/9/16)
If there are any grammar problems, let me know!

=TL;DR AT THE BOTTOM OF THE REVIEW=
I came to this manga with a strong heart and a raging erection and what came out of it was just more than a little tease of the tip. This manga itself is amazing and seems to be one that I would recommend anyone who isn't just looking for titties to just read and enjoy.
SCAO Rating system. (Story, characters, art, and overall)

[S]tory
The story is summarized at the description of the web page but basically, our MC, Kasuga Arata lives in a normal town until suddenly, it's not the fire nation, but a Black Sun appears. His life was created in a tiny ass book and now he possess a Grimoire (basically a mage book). The story itself is kind of unique but also has that cliche feel to it and it doesn't make you go wow, but as the story progresss you find that it builds up from that original setting and doesn't abandon it half way. You know how it happened, and they will continue to build on that, rather than giving a story and showing you titties every second page. You start to invision yourself in the story and makes you want to have a sick ass magic book for yourself too.

[C]haracters
The MC is Kasuga Arata and man does it give you one interesting and funny MC. In most cases, the MC in any ecchi manga/anime is one gigantic pussy and will find himself accidentally falling over and landing on big tits or pulling down panties with his mouth but not this one. Kasuga himself EMBRACES his pervertism and this makes him a really enjoyable character and not a cut and paste pussy ass bitch of an MC. The SCs are also very nice, but cliche at the same time, from quiet. flat girl to obnoxious big titties girl. The villians are my main concern though. In short, they have no objective. They have the typical, "I want to destroy the world!" background and it just makes it seem like they are just there for forwarding the story. Although, they are still remotely interesting, but not enough to make me feel like they are any importance to the story.

[A]rt
The art is very nice, especially when it comes to summoning a spell or using a weapon, the artist uses what they can of the page to make it look like it's really coming at you. The environment is also a nice added touch, but it doesn't expand too much on it. The main point of interest is the characters. They all look very unique (aside from the MC) and the instance you see the character you know who exactly it is and what they are like. It's also not too noticable of a difference (i.e Danganronpa characters) that they are the highlight of the page, they blend well with the other characters and it just makes it seem nice.

[O]verall 8/10 Arararararagi-kuns.
I would recommend giving this manga a shot, the anime is nice too but the manga is more well built so to speak. Art is fun and unique, just makes you want to read and look at it more. The manga gives you a nice vibe rather than just skipping through the pages to just look for some fan-service. If you want just pure fan-service, I would recommend reading To-Love-Ru or Rosario Vampire. One of those two will make you do the Full Salute or Rushing Rivers.

=TL;DR=
Fun story, interesting characters, awesome art, a right amount of fan-service and an amazing story to make you want to keep reading.