If you're looking for manga similar to The Reformation of the World as Overseen by a Realist Demon King (Light Novel), you might like these titles.
One day, a train accident occurred in the morning. It was the start of everything. The people who were riding on it were invited into a white space. What awaited them there was an old man who claimed to be god. The old man said: "I will transfer you to a different world. I will give you a power to help you survive." Several hundreds of cards facing down appeared in the mid air. What Fujiwara Nobuhide, a trivial temporary employee drew, was [The ability to make a town]. This is story of a certain man who has the ability to make a town in a different world. At first, it started as something like Edo from the Tokugawa Period. However, my goal is a modern city. I’ll do my best!
“I reincarnated as an evil god.” Takuto Ira, after dying from illness at a young age, is reborn into a world just like the strategy simulation game he loved in his past life, “Eternal Nations.” There, what appears before his eyes is a girl, Atou, whom he had used before in the evil civilization he previously subdued in the game, Mynoghra. The two resolve to create a new nation in this world once more.
Presented with the strange Gift of Village Building, Luke, the son of a lord, is cast out of the domain in shame. He arrives in a barren land with plans to develop it as well as he can, and to live a simple, quiet life...when suddenly his mysterious Gift activates! Enjoy Luke’s amazing, slow life, and watch as his village grows, his Gift levels up, and his village-building capabilities transform in this new comedic series!
Hiiro was reincarnated as the third prince of a tiny nation. In his search for a way to strengthen the country, he dabbled his hands in the omnipotent alchemy. Along with his modern knowledge, he improved the country’s production processes and introduced salt-panning. In this small land surrounded by larger countries and the threat of magic beasts, Hiiro declared before his despairing citizens that he will ensure them a prosperous life. “What I want is not just to save the nation. I want to create a better tomorrow for you all!” The nation-building of a small country by his own hands starts now!
Iris Almeria, the daughter of a powerful duke, is arrested and forced to her knees in front of her fiancée. Her betrothed, Prince Edward, is rejecting her for another woman! As Iris's life flashes before her eyes, she suddenly realizes she knows exactly what is coming next–because she has been reincarnated into her favorite otome game as its villainess. Quick thinking saves her from exile, but Iris can't rest yet. If she wants to survive this world that sees her as wicked, she'll have to change the world itself.
A protagonist reborn in another world. Apparently he had been reincarnated as an abandoned child. Before his eyes were abandoned children like him. In order to survive, he led them into farming. Little by little, orphans gathered, and upon hearing rumors of a village, others began to migrate. The group that had been nothing but children had become a village before anyone realized. And then various countries in the surroundings started to have an eye on it…
A smart, athletic, who handles anything perfectly and unequalled beautiful girl, dies young due to a car accident. And now, while possessing the memories of her previous life, she reincarnated in a fantasy-ish different world with swords and magic! All lives were dependant of magicians, however, their numbers decreased every year due to the magic power (mana) scattered around the world running out, thus the reliance on magic for living was coming to an end. A story that will lead to the life of a girl relying the knowledge of her previous life, as she proposes a way to live even without the use of magic while seeking for what it is, and aiming for a wealthier life.
After crash landing in a foreign land filled with magic and monsters, most people would wonder what to do next. For seven of Japan's greatest high school geniuses, the real question is how much are they allowed to mess around? This world might not last long enough for these insane prodigies to go home...
A hero is reincarnated in a different world. He gather together orphans and starts a farm. Over time as more children arrive, the farm becomes a village. Founding a orphan village in another world.
The man who reigns the pinnacle of the VR battle simulation game “Apocalysphe” experiences a severe headache while playing one day and loses consciousness. When he awakes, he found himself inside the castle of Esteldobaronia, the country of magical beasts, and that he was in the form of its human king, Kalon. Forced to live in this other world as Kalon, he feared his frailty as a human despite being in command of the powerful magical beasts. To make things worse, a crisis approaches the country while he has yet to sought out his feelings…!?