All fear comes from insufficient firepower.
After transmigrating into the world of Demon Slayer, he becomes the heir to a financial conglomerate, activates a sign-in System, develops the military industry, learns Thunder Breathing, and builds up his own forces.
While others painstakingly train their Breathing Style and risk their lives with swords, he simply brings out weapons from the real battlefield:
MP40 submachine guns, M2 flamethrowers, bazookas, M42 machine guns, stick grenades, Barrett sniper rifles, and high explosives.
Every round is loaded with special Wisteria and sunlight ammunition, made specifically for slaughtering demons!
Demons are fast? A hail of submachine-gun fire pins them down!
Demons regenerate quickly? The flamethrower burns them faster than they can heal!
Upper Ranks getting cocky? One bazooka blast blows them to pieces!
Shinobu Kocho, Mitsuri Kanroji, Daki, Giyu Tomioka, Tanjiro, and Nezuko: their endings will all be rewritten.
Use firepower to crush every demon in the world!
The pictures in this book currently include: Tomioka Giyu, Butterfly Ninja, Fallen Princess, Kanroji Mitsuri, and Purgatory Anjuro are all in the comment area at the end of the corresponding chapter.