Mahouka Koukou no Rettousei - Chapter 7Volume 5 -

Huang Dan’s pain nerve is innately different from the ordinary people. A little tore in his skin can cause him to sweat all over his body painfully to the point of him unable to make a word out.

Somehow, he began to cross world, following Mr. System to do the tasks…

In the first world, Huang Dan realizes what it means to die painfully and to live to die again.

TL’s summary:
MC suddenly transmigrated and is bind to a system, requiring him to solve mysteries. Born with a higher degree of pain sensitivity, he met different people in the different worlds and learns what kind of emotion smiling is.

- Description from Novelupdates

Leo used to be an affluent rich young master, who fell in love with a foreign beauty and after a night of passion, they got pregnant. The young man returned home to discuss the issue with his family only to be struck by a tragedy that changed his life completely.After eight months of laying in the bed like a vegetable, he woke up because the Almighty Father System selected him as a host. From then on, Leo's life changed once more, but this time, it was not the world that flipped him over, but he was the one who flipped the world upside down.Would you like to read about the story of a vegetable rising from the brink of death and becoming into a godly existence who slayed gods, and demons only so that he could bring a smile to his daughter's face? Come along then.

A boy awakens alone in the Fairy Tail world, lost and uncertain. As he ventures through this magical realm, he unravels the secrets of his mysterious new identity, unlocks hidden powers, and carves out his destiny in a land brimming with wonder, danger, and limitless adventure.“Check out my other work, Reincarnated as Ash: A Pokémon Tale.”

Once upon a time, a hero had been summoned to a different world in order to defeat the demon king. After the war stretching 3 years ended the commendable hero slew the demon king. And he was forcibly deported back to earth after being dismissed.

Such bullshit!

Elves in addition to beast race, dwarfs and demon race. Even though I wanted to make a harem in the different world I saved! My dream will not come true on earth, where there is no magic at all. Thus, the hero returns on his own. Without the blunder of being extradited to earth this time, he will build a harem of his own in a different world.