Shinmai Maou no Testament

First of all, let me say that however much I will insult this manga, I did enjoy it to the fullest. This manga by UESU Tetsuto and MIYAKO Kashiwa is about a first year highschool student, Toujo Basara, getting two new stepsisters after his father remarries. Before he knows it, his life gets turn upside down.

Story:7/10

The story starts off as a generic romance-incest-ish manga, but turns into so much more. It does develop the story well, but personally, I feel that they should focus more on the plot instead of adding unrelated scenes for the purpose of adding the ecchi tag on this manga. Even though I do enjoy these scenes, it seems to stall the development of the story.

Art:10/10
What really drew me to this manga was the art. Have you even seen the vivid colours and character designs? Stunning. The art is very consistent throughout the manga, which is really saying something as the bar was raised high with that fantastic cover. Ten out of ten.

Character: 7/10 (Some spoilers, if you are majorly sensitive to spoilers, better skip this part)
The main character, Toujo Basara, is pretty generic. Oh no, the girl who cheated me out of a house is my sister! We are FAMILY! Who cares of she's the only daughter of the Demon King and keep her and PROTECT her in the house! To add on, he's majorly over-powered. BUT, I have to admit that I do not dislike him.He does fight for himself and knows that he is not the strongest. Plus, he is not a major pervert of accidentally touches a girl's boobs or anything. His tragic backstory is like any other character, so I am going to skip it for now. Moving on...
Moi Naruse. It is really hard to find a character like her that has actually some form of dignity, even though by one solid week, the main character felt her boobs and everything. Stupid fanservice. (but without it, 72.6% of the audience will lose interest, so moving on...)
Oh god no. THE LOLI. Skipping this, i don"t care.
The childhood friend of the main character, Yuki Nonaka. She is the typical "i fell in love with you when you SAVED me FIVE YEARS AGO." tsundere-ish character to her. Hopefully she stays cold, cause that's about all that is interesting to her. There is not much more i can say without spoiling the whole manga.

Enjoyment:8 Overall:8
Overall, I enjoyed this manga greatly. I definitely recommend this manga for all that likes ecchi, a bit of romance and awesome art this manga. Don't go for this if you are looking for some down to action supernatural series, though. You can read it on Kissmanga.com, it is a great website.

I don't know how you arrived here. Maybe you came from the anime and wanted to check the original material out, or maybe you already read a Light Novel like this and wanted to give another one a try. Before you decide on giving this one a go or skiping it, let me tell you what I thought of it.
The story doesn't start off too complex. The main character is a former member os the hero clan and his two addoptive sisters are from the demon clan. The main character wants to protect his family, and so they enter something called a Master-Slave Contract in order to gain the strenght to fight against their enemies.
That's basically what you need to know before starting.
The first thing to note, if you came from the anime, is that a lot of scenes (especially from season 2) were censored. And I'm not saying that the violence was censored, I'm saying that the more lewd parts of the story were censored, so it might be worth going from the beginning with this one.
For the most part, the story develops nicely, and so does the lewd parts. As the story becomes more complex and involving so does the lewd scenes. No matter for which reason you began, you won't be too disappointed with how it develops.
This Light Novel has 3 story arcs across its 12 volumes. The anime covers the first 2, leaving only the last one behind.
While the first 2 arcs are really good both in the story and ecchi departments, the last part leaves a lot to be desired. Stakes that were present during the majority of the story are suddenly gone because they became inconvenient and the battles become confusing with the sudden addition of new things that weren't present before.
There are also other things that contributed to the last part not being all that great, but I won't dive into them since they would be spoilers. Just know that, if you're a bit sensitive on some topics, maybe let this one pass.
If you're willing to see these characters' stories to the end, then give this one a try. But if you're here just for the ecchi, then maybe stick with the anime.