Demon Slayer: Big Technology, the Era of Substitutes Is Coming

Flesh and flesh are short, and machines soar. Rocket launchers, mechas, and tanks, aren't they more effective at killing enemies than swords? Times have changed, adults. Human beings have limits! So I chose a substitute and a firearm to solve the problem. Gui: This person is very defiant, how can I beat him? Ghost 2: This is unscientific, his weapon can actually kill me! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.