Super Gene Ⅱ: Evolution - Chapter 17: The Failed Evolution of Organisms

A former sporting rifle shooter genius transforms into the ‘Juvenile Butcher’. While originally supposed to have received the death penalty, he was instead fortunate enough to have entered a secret and highly regarded armed force, throwing himself into the ‘Nirvana Project’.

After a period of 10 years, he now has time to freely recover. Having trained until he had excellent military and martial skill, he sweeps through various military districts and returns back to his hometown. Under the monitoring of a beautiful female cop, he re-establishes his family’s bodyguard service, protecting beauties and moving unhindered, his achievements causing the fame of his outstanding, god-level bodyguard service to resound across the world!

- Description from Novelupdates

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.

Our protagonist Caam is a man from Earth that was reincarnated into this world as a demon. In order to survive, he spared no effort in avoiding the sparks of battle and without noticing it, he became strong himself.

The most cherished Little Princess of the Dragon Clan has fallen on hard times, living in an era of scarce provisions. Thankfully, she had a grandmother who doted on her as much as life itself.She drank brown sugar water every day and ate chicken eggs for every meal, making her plump and fair-skinned; she also donned new clothes for every season. All the young women and newlywed brides from miles around were envious of her naturally good fortune.However, the Little Princess had her woes: she was a dragon, and she craved meat, meat, meat!!Watch as she flexed her Dragon's Prestige —With just a glimpse at the trees, wild chickens would stiffly drop to the ground.If she stood next to the river, the fish inside would voluntarily leap onto the shore.Merely standing still, wild rabbits would run into her thigh...And as the Dragon Clan were fiercely protective of their food, she would fight anyone who dared to snatch her eats.Her fierce reputation extended far and wide, causing children in her group to take detours around her.Many people sneered: “With such a greedy, delicate and fierce character, she will definitely remain unmarried!”A certain Great Demon King who followed her said, “Marry me and become my wife. My home has endless supplies of canned beef, beef jerky, Dabai rabbit milk candy, imported chocolates, and various kinds of meat...”