I do remember the main character and his village managed to invent something thanks to Mc's japan memories, but their profits almost got scammed by a group of merchants.

I'm very late to this fandom, but that doesn't stop me from finding out more about the strange things in this anime, I would also be very happy if we opened a discussion about Charlotte again xD So, when they say these powers will disappear when they turn eighteen, then why do the people in the f...

My bad, I have forgotten most of the details for this manga. Sorry for the bad memory. He invented modern stuff unheard of after he isekai-ed as child in a certain village name which I cannot remember. Also, I don't think there is a love interest. No sex/nudity/gore either. The manga is in black ...