My starting summon is a small skeleton - Chapter 374 - 371 King-level Feedback

Earth, thousands of years after the apocalypse.

Countless technologies and advances had been lost to time as the Specters, horrifying beings with terrifying powers, arrived and destroyed the world.

Over the coming thousands of years, humanity had built itself up but always died again.

Nobody remembers the past.

Nobody remembers what humanity had once accomplished.

Now, everyone is living in a world where the Specters reign supreme.

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A boy with amnesia woke up in the middle of the Dregs, the worst part of Crimson Fungus City.

The boy grows up and manages to become strong enough to pass an exam for one of the most prestigious jobs in existence, a Zephyx Extractor, someone that can harvest the powers of Specters.

Sadly, he had already gained a power from a Specter in the past, which made him ineligible for the position.

But then, a mysterious man visits him.

And his luck finally turns around.

……………………………………………………………

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Mu Yue traveled to the world of Naruto and became an ordinary chuunin teacher at Konoha Ninja School and a member of the Root Organization.

Fortunately, after awakening the teacher system, you can become stronger by teaching.

In order not to become Danzo’s consumables, Mu Yue worked hard to teach and increase her strength.

“Complete the teaching rated A for the first time and receive the reward – mastery of fire attribute chakra properties change.”

“Under your guidance, Uchiha Shisui has worked hard to practice, and his overall strength has been greatly improved, and he has been rewarded – the Immortal Human Body!”

Under Mu Yue’s guidance, Zhishui understood that the village’s enemies were not necessarily other big countries, but could also be within the village. People who spoke righteously about the will of fire might not necessarily act in accordance with the will of fire.

Obito got rid of the title of being the weakest person in the ninja school, and Metkai became a master of physical skills even earlier…

- Description from novelbuddy

After crossing, I discovered that there is a resurgence in the East and there is a dawn in the West.

The steam cannon and the mysterious collision, the Western extraordinary gradually awakened.

[Blasting Master] + [Steam Expert] = [Machinist]
[Soul Master] + [Swordsman] = [Curse Swordsman]

A variety of advanced, transfer and hidden professions, as well as never-ending exploration.

As the mystery of the West gradually unfolded, the ancient gods gradually recovered, and a world full of freshness began to kick off in front of Sulu.

The old god is recovering, the new god is rising, what should ordinary people do? Fortunately, there is a property panel!

- Description from uukanshu (translated)

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.