Why must we be alone?

We all have heard of the same old story. "A lady dies, gets isekai-ed into a book she was reading" or maybe, "A man dies, get isekai-ed into a fantasy world" but its always the same old story. They are always the only person there from another world, of course, on the off chance its a unique story- there will be another person with them. But what if its not an grown adult but a teen who is sent to another world, and what if she isn't alone she has her friends with her? Would it change the old story a lot or will it, in the end, have the same story just with a few more characters? Will a group of children survive in a world dangerous for even adults, where adults are cautious with every step; how will reckless children survive?