"When a Military Otaku Reincarnated in a Magic World, They Created an Army Harem with Modern Weapons!?"

The main story is complete. Afterstory serialization in progress. Yota Hotta, a 27-year-old virgin, former bullying victim, and former shut-in working at a metal processing company—that's me. I'm a military otaku and gun otaku who loves modern weapons. I used to dream about making handguns using my own metal processing skills, but one day, out of spite, I was killed. However—when I opened my eyes, I had been reborn as a baby in a different world where magic and sorcery exist!? As someone who also loves manga, I tried to master magic, but my talent for magic and sorcery was merely 'insignificant.' I was told by El, the big-breasted rabbit-eared sorceress who runs the orphanage and raised me, that it would be impossible to survive as a magician with such magical power. But as a former Japanese downtown craftsman, I used my intelligence, magical processing techniques, and magical tools to create modern weapons—revolvers, assault rifles, sniper rifles, and more! While my gun occasionally misfires and blows off my fingers, my silver-haired dog-eared childhood friend Snow (destined to be big-breasted) worries so much that she hugs me and nuzzles against me (apparently she loves my scent), I finally create the revolver 'S&W M1010' and face off against my first enemy, a monster—. This is the story of a boy who might one day become a hero, renowned for his revolutionary military power through his intelligence and unique magical tools, and who would save the people of the world with the strength of his own personal army (harem)— (Planned to include slavery, harem, and bloodshed. People will die. Please be cautious if this is not your preference. By the way, the marriage bracelet on the protagonist's hand is planned to increase. ...It's a harem after all.) "Book publication has been decided by Kadokawa Corporation, Fujimi Shobo."