It has been a law since ancient times that the protagonist is number one in the world, just like the protagonist cannot die.
One day, the heroine Mary Sue was attracted by the "Lord God". She was very lively in various worlds and conquered a group of scumbags.
Another day the heroine met a genius alchemist whose ability to take care of himself was extremely poor.
So, saving the world is so cute~~
In fact, it's a chaotic era of competition for the title role.