Main story concluded. After-story serialization ongoing.

I, Yota Horita, a 27-year-old virgin, former bullied child, and shut-in, working as a metalworking company employee, was a military otaku who loved modern weapons, and also a gun otaku. I, who had been fantasizing about making a handgun using my own metalworking skills, was killed one day due to a grudge. But then—when I woke up, I was in the form of a baby and had been reincarnated into a fantasy world where magic and sorcery existed!? I, who also loved manga, tried to learn magic, but my talent for magic and sorcery was "only a tiny bit." "It's impossible to live as a magician with that much magical power," I was told by Elle, the buxom, rabbit-eared magician who was the head of the orphanage and my foster parent. But as a former craftsman from downtown Japan, by fully utilizing my intellect, magical processing technology, and magical tools, I set out to create modern weapons—revolvers, assault rifles, sniper rifles, and more! After my gun backfired and blew off my finger (among other mishaps), while my silver-haired, dog-eared childhood friend (destined to be buxom) Snow, worried sick, hugged me tight and sniffed me (she apparently loves my scent), I finally created the revolver "S&W M10" and confronted my first enemy, a monster—. This is the story of a boy who, in later generations, would be called a revolutionary hero for his intellect and military power derived from unique magical tools, and who might become the man who tried to save the world with the power of his own army (harem)—

(Contains slavery, harem, and gore. People will die. Those sensitive to such content, please be advised. Also, the wedding bracelets on the protagonist's hand are expected to increase in number... because it's a harem.)

『Book publication has been decided by KADOKAWA Corporation, Fujimi Shobo.』