Is It Reasonable for My Eight-Year-Old Child to Slay a Dragon with One Sword?

At an inadvertent moment, the gears of civilization deflected. Technology and magic are roaring in the world, gods and dragons are overlooking the sky, and the present world and history are overlapped. Today's world is like a product of the past and the future, with an upside-down tower of reason dormant under the shadow of bright neon. When the blood of the gods burns at midnight, when the dragon's form dies under the moon, when the power of taboo reappears in the world... The bell of ten thousand years is ringing again. If the ancient civilization makes a comeback from the buried history books, then where will mankind go? The gods of the past are no longer there. In this glorious but desperate era of man, there are only two things we can do - Swing the sword, or die. (No harem, no heroine)