What Do You Mean There Are Other Transmigrators In My Harem Fantasy? Novel

I'll rewrite this novel description as a synopsis, using only the information provided without adding anything new. After being killed by the classic truck-kun incident, the protagonist receives a second chance from the gods to live in a fantasy world filled with swords, magic, and dragons. However, instead of pursuing heroic deeds or world domination, they have a singular passion: traveling to discover fascinating materials that will inspire amazing stories. Their plan is simple—explore dungeons, investigate ancient ruins, meet eccentric individuals, and enjoy life's pleasures including fine cuisine and romance. But complications arise when strange individuals begin appearing in this world. A self-proclaimed hero obsesses over slaying a demon lord. Someone threatens global destruction with nuclear weapons. A bizarre vagrant breaks into homes destroying pottery for coins. The shocking realization hits: there are other transmigrators in this world, and their presence is turning the protagonist's fantasy adventure into something far more chaotic than anticipated.