If you're looking for manga similar to Jii-sama ga Iku (Light Novel), you might like these titles.
At the request of God, a Japanese salaryman, Toudo Yuuki was transported into another world as practice for the actual Hero’s summoning. And now, he lives as the herbalist, Shin. Making use of his past knowledge, he concocts powerful potions and travels the world selling them. However, due to its potency, he was drawn into a certain country’s conspiracy. But, they did not know. That despite his outward appearance of a good-willed person, he in fact held the strength to slay even a dragon.
Hayami Shun is an ordinary worker at a trading company when he found himself floating in the sea in another world after walking out of the building. He was resigned to his fate of drowning when he was saved by a creature which had the upper body of a horse and a lower body of fish, a Kelpie who called herself Requaire. In this other world which had just entered the age of seafaring, Shun uses his in-depth knowledge of trading to make a name for himself. Along with the mysterious and expressive Kelpie, Requaire, will Shun be able to rise up in the market of trading!?
Handyman Saito has never been anyone special. All his life, he’s had average grades, ordinary athletic skills, a commonplace job… But his unremarkable path takes a turn when he wakes up in another world. Here, warriors, wizards, and elves accompany him on quests delving deep into dungeons, and Saito realizes for the first time what it’s like to be needed. After all, who other than the handyman could be trusted to open locked treasure chests or to repair his allies’ equipment? Beginning with a simple “thank you,” this is the story of an ordinary person’s fulfilling life.
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.
Kazura bought a lottery ticket on a whim but he was selected as the winner and received 4 billion yen (about 40 Million US$). To evade the hyena's that smell the scent of money, Kazura takes shelter in an old residence that was handed down from generation to generation. When Kazura is investigating the place that would become his shelter, he stumbled on a certain room where it is possible to go to another world. The culture and technology level of that world is relatively low. The protagonist sometimes brings back goods or sometimes technological knowledge. At that world, he will find his value as a person.
One day, Kosaka Mitsuki was abruptly sent on a trip to a different world. She was an otaku, so she adapted really fast. Then she decided to live her life as a magician. She made a living by making full use of the benefits of the automaticly translated knowledge and language of her original world. But reality was harsh.She was keenly aware that she was handling ‘Bishie’ from this different world who could easily conquer a maiden hearts and dreams.
Six years have passed since Urano began her new life as Myne, and so much has happened. She went from being a simple commoner to an apprentice shrine maiden, then she was thrown into the world of nobles as Rozemyne, the adopted daughter of an archduke! “But I’m not the only person with a lot going on! You can say the same for everyone else! Though, uh... I guess that’s mainly because of me.”
"A falling star has brought the chaos. The throne of fate has lost its master. The nonbeliever who walks in light and darkness will make his debut. "In this magic world, knowledge is power.
"No one will capture me!" Mizuki, a grown-up who loves gaming, is suddenly swept away to another world. She resolutely survives by using her inherent grit and magical talent. Then, two useless knights and one particularly kinky knight arrive on the scene. The appearance of so many disappointing hot guys marks the beginning of Mizuki's unprecedented, alternate-dimension life! Her chosen lifestyle involves nothing but "being herself!"
A man who while playing a game in Japan, died of cardiac arrest. In the brink of death, he was asked a favor by the Goddess of the eroge he was playing "After defeating The Great Demonic Lord, please save the world from the tyranny of the hero" to save the world. Using his knowledge of the current era, and his summoning arts, this is the story of a man who steals the heroines of the hero...