I like this LN but saying the truth it is written on average level.
The story is about a psychopath Hifumi who wanted to kill people but being lawful person couldn't follow his desires in our world. And luckily main character had a chance to be forcibly transferred to another world. He starts his adventures with murdering a god, a king and some knights. Later we start to understand that this action was more or less justified.
Readers may like the story as it is abundant with action so for me it was hard to stop to read it and go to sleep. I liked Hifumi struggles with Orsogrande princess. My favourite character in a story is Origa who reminds me Albedo from Overlord a bit. Despite being very bloody and cruel "Summoned slaughter" is very light as it is extremely naive. When Hifumi protects someone then this person becomes practically immortal. When someone opposes him then the one is presumed to be dead despite few exceptions left alive on purpose to create a world more amusing for Hifumi. There is a lot more unrealistic examples. City can be evacuated within few hours through one gate, new district of a city can be rebuilt within few days without its authorities knowing it etc.
It is first time I read a story where main character is so invincible and generally better in everything then other world inhabitants. And it is caused by invisible hand of an author. Being 18 (?) years old Hifumi is master of much more then one martial arts. Knights do not know how to fight, politicians are unable to scheme etc. And it is first time when I lost my interest of MC and I preferred to read side stories. Following from one described the same way one sided slaughter to another may be interesting but not all the time.
There is a lot about politics, economy, country administration which I really liked. Despite being evil Hifumi is doing a lot of good things by creating a nation of happy people by using his modern knowledge. Generally his actions have a positive results despite his evil desires. It is a shame that this actions do not follow his boring character which does not change.
EDIT:
A lot of girls is attracted by main character but he cares only about killing. There is some romance and even a serious relationship is created . Till now I found out two short side threads with a romance of side characters.
EDIT: There is more romance (weird one) and a kind of harem in later chapters
There is one tragic element in a story but I did not shred one tear as it was artificial and easy to predict. My only thought about it was: "People do not behave like this". And you do not care when so many people is killed anyway.
It a shame the this LN is translated in average level. And because of it I had to ponder a lots of times to understand some dialogs or narration parts. In case of wrong words it is possible to change it in our mind on the fly but in case of wrong sentences it is difficult.
If you like action and you are immune to bloody description then you may like this story. If you looking for something more serious, realistic then you may be disappointed. I continue to read this LN.