Shinwa Densetsu no Eiyuu no Isekaitan - Volume 1, Chapter 3 – Awakening Part 6

The story is about a a hitman, Who dies because of his own recklessness and transmigrates into a game he used to play after his retirement as a hitman.I'm not gonna spoil any further, but i might answer few of your questions.Is MC overpowered?Nope, he'll become strong over time and all battle he'll fight will be because of his effort and techniques.Is there magic and adventure?Yes! It have both magic like normal isekai with adventure and fighting with monsters and many other things. There are other important things like “Essence Stone” But let's talk about it in the chapters.There will be harem?Not really, He will be in contact with many beautiful female and males but one waifu but i haven't decided yet.All i can say is, give it a try, I'll try my best to make it worth your time.

The daughter of the Su family who has been missing for more than ten years has been found!

It is said that this daughter is a bum who doesn’t understand anything…

The owner of a luxury store of an international brand: The royal designer of a luxury brand, you say she doesn’t understand anything?

Some people say that she is an illiterate female who has not attended school for a day…

Retired professor of a university: My favorite student is illiterate? ! What are you? Is it rubbish?

At the banquet, Shao Pei put his arms around the shy person in his arms and said to everyone: My family Xixi is gentle and soft-hearted, don’t bully her.

A certain rich second generation who was maimed by her and was still lying in the hospital: … Pei Shao, you may have misunderstood the word gentleness.

- Description from novelbuddy

In her third year living in this steampunk world, Ciel gained the ability to simulate both the past and the future.These simulations turned into a game where she could act without restraint, and after countless trials, real life became a replica she could navigate as though speedrunning it.Churches, potions, mutations, the Old Gods, witches, sealed artifacts… none of these have anything to do with Ciel. She’s just an ordinary girl who wishes for a peaceful life.She just happens to be particularly skilled at snuffing out danger before it even begins.

On his usual way to home Mikado Tsuchio fell into a hole that suddenly opened on the ground. Just like that, Tsuchio falls in a different world, he lands on a Grappler Wyvern and manages to tame it.

Tsuchio decides just like that to live in the other world, the reason for his quick decision: he wants to make a monster girl harem.