In the Beginning, the Emperor Passes the Throne, and One Hundred Thousand Barbarians Surround Dragon City.

After being reborn and traveling to ancient times, I became the most disliked prince by the current emperor. As a result, the Northern Barbarian cavalry besieged the city, and the old emperor ran away with the other princes and princesses, passing the emperor on to me, leaving me to clean up the mess alone... Do it! Learn physics well, and you will not be afraid of traveling all over the world. Look at how I can sweep away the Northern Barbarian cavalry with machine guns and cannons... What? Seeing me repelling the Northern Barbarians, the old emperor wants me to return the throne to him? There is no door! !