Heidi and the Lord - Chapter 15

Wonder Woman: Why are you Superman’s younger brother? Eric replied: On the first day of travel, I, who was also a baby, climbed into Superman’s baby capsule, pushed him out, occupied the nest by myself, and became a “son of Krypton”.

Superman: Why don’t you save the plane? Eric replied: I will not lift things by stepping on the air.

Batman: Why didn’t kryptonite work for you this time? Eric replied: I originally wanted to get along with you as a Kryptonian, but in exchange it was alienation.

Okay, I’m not pretending anymore, I’ll showdown, I’m a native of the motherland. …… This is a story about a man who was mistaken for a Kryptonian with a template of the motherland, but is actually a sinister and black guy who is doing things in the world of superheroes.

- Description from novelbuddy

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.

Having reincarnated into a different world, Murong Lin found himself utterly bewildered.The golden finger system informed him that he needed to eliminate the protagonist—wait, he wasn’t the protagonist?Innocently, Murong Lin turned his gaze towards the designated heroes, a butcher’s knife clutched in his hand. Regretfully, he realized he had no alternative but to end their lives if he wished to survive.Hold on, this pig was a protagonist too? And that tree?Without any choice, Murong Lin found himself forced down the path of bloodshed.

Time travelling from the majestic era after the Recuperation of Reiki, he became Kimura Kazuki, a 16-year-old high school student in Japan, one year before the Reiki Recuperation.

Tentatively, he set out to hone himself to the bone, burning candles at both ends to stockpile resources in preparation for the imminent Recuperation of Reiki. His goal was to be many steps ahead of all humanity when the time comes.

However, it seemed like fate had decided to play a cruel trick on him.

One year later, the Recuperation of Reiki… did not happen as expected.

- Description from Novelupdates