I Don't Want to Seize the Throne, so I Am Forced to Change the World

I just killed an enemy and was killed by his men. If you die, just die. Anyway, you have nothing to worry about anymore. Unexpectedly, after my death, I traveled to a different world, and also to a prince of a country. Now there's good news and bad news. Good news, this world is technologically backward and magic exists. I came from time-travel and have an ability called fantasy creation. I can make the things I dream about, pistols, grenades, Barrett... Bad news: Just after traveling to the past, he was involved in a dispute for the throne and is currently being hunted. … After evading pursuit, I tried to escape from this bloody struggle for the throne. During this period, I met Leona Loderink, the first princess of Trotlis and my sister. At first, I was happy that I had a lovely sister, but who knew that this lovely sister was also an ambitious and ruthless person. She only contacted me to test whether I was coveting the throne. To this I just want to say, "Your Highness, I really don't want to compete with you for the throne." Just when I once again thought that I could escape from this bloody farce, my Majesty unexpectedly pulled me onto my horse. In the future, I ostensibly became Leona's life mentor, but in fact I assisted her in her fight for the throne. In a world where there has never been a female king, help a woman ascend to the throne. Really, it gives me a headache just thinking about it.