The Neighboring Planet Is Cultivating Immortality

In the future, humanity develops technology for crewed interstellar travel. The first group of astronauts on the project is sent to the nearest habitable planet beyond the Milky Way, but an accident occurs during landing. They may never be able to return. The good news is that the planet really is suitable for human life. While exploring it, they discover that humans live there too. The difference is that this world’s technology is underdeveloped, and it resembles the fantasy worlds they have seen in novels. After a time, they integrate into this new world. What changes will they bring to the planet? Will they ever make it home?