I Turn Ancient Times into Modern Times!

I opened a shop in ancient times. What I sell in my store are all modern items. Of course, airplanes, tanks, and Italian cannons are also considered modern items—— This is very scientific. So... At the same time, I became the omnipotent god in people's hearts, the king of hell who harvests lives, and the devil who plays with people's hearts. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.