Fantasy

Medieval times, warring knights, dragons, demons, gods, pirates, behemoths…
    Barbaric, ignorant, backward, numb, starvation widespread, people unable to make a living…
    Damn it! Punch to explode this era!!
    Reclaiming wilderness, farming, bridge building, road paving, coal mining, excavating minerals!
    Leveling up, recruiting apostles, forging an army!
    Barrage troops! Pushing horizontally!
    Quack! My steel torrent is invincible in this world!!
    Roman: “I am your destiny! Kneel before me!”
    So, you were supposed to farm, but somehow you ended up establishing a vast empire and becoming the emperor?