A lot of "Reborn/summoned into another World" stories already exist. And this is just another one of those. A renowned scientist died and is reborn in another world. While still living within our world he craved for knowledge but therefore was alone. He had no actual experience in actual relationships or anything else like that. And thus he gets another chance in another world. Most of his memories are still there and in this medieval world filled with adventures and magic he uses his knowledge to build machinery and develope new technology, while trying to socialize. He even tries to learn magic and invent revolutionary machinaries that are able to simplify everyones work and bring prosperity to the people.  Even though he has a magical aptitude there is a problem with him, which makes this seemingly impossible. Absorbed in his work will he be able to change and socialize, or will it all be for naught and he falls back into his old habit. This story is something like his diary and without going too far into detail, experience it for yourself.